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Depiction of Atlantis, a supposed lost city that has inspired myths and legends. Credit: Wall Paper Delight

Three mysterious cities submerged beneath the sea

Beneath the waves, the ocean holds priceless historical treasures. We explore the fascinating stories of Pavlopetri, Thonis-Heracleion and Port Royal, three cities swallowed by the sea.

ISABEL RUBIO ARROYO | Tungsteno

 

The lost city of Atlantis has captured the collective imagination for centuries. According to ancient myths and tales, this enigmatic land vanished mysteriously beneath the waves. Despite the fascination it generates and the countless theories and searches for its supposed underwater ruins, science has found no conclusive evidence of its actual existence. However, history does offer us real examples of cities that have truly been claimed by the sea.

 

A window into the Bronze Age under the sea

 

In 1967, British oceanographer Nicholas C. Flemming discovered the remains of an ancient city under the sea, near the island of Elafonisos in southern Greece. The site was identified as Pavlopetri, a settlement that is thought to date back to the Bronze Age. The following year, a team from the University of Cambridge organised an expedition to study the site. Around 5,000 years old, Pavlopetri is one of the oldest known submerged cities, with streets, buildings and tombs still preserved beneath the sea.

The prehistoric city covered 90,000 square metres and featured a complex water management system—with canals and drains, as well as a cemetery. “This neglected place in prehistoric times had occurred to be a thriving port with intense social stratification, and a lifestyle that made the Head of Investigation John Henderson to talk about the Greek Pompeii,” note the authors of a 2016 study. Several studies suggest that the city may have been submerged around 1000 BCE. Three theories attempt to explain how this happened: one suggests a gradual rise in the sea level, another a sinking of the land, and a third that a combination of earthquake and tsunami caused the city’s disappearance.

 

 

Digital reconstruction of Pavlopetri. Credit: University of Nottingham

 

Temples, jewels and sunken ships

 

In the year 2000, underwater archaeologist Franck Goddio discovered the ancient city of Thonis-Heracleion, located seven kilometres off the Egyptian coast in the Nile Delta. Founded in all likelihood in the 8th century BCE, this port city served for centuries as the main gateway to Egypt for ships arriving from the Greek world, and it was renowned for its commercial and religious significance.

The city suffered several natural disasters, and it is believed that an earthquake eventually caused it to sink beneath the sea. The European Institute for Underwater Archaeology has studied the submerged site and uncovered more than 60 shipwrecks near its ruins, reflecting the area’s intense marine activity. During excavations in 2023, researchers discovered the remains of a sanctuary dedicated to the Greek goddess Aphrodite, as well as a temple to the god Amun. They also found gold jewellerysilver artefacts, ceramics, and bronzes imported from Greece. Well-preserved wooden structures were also found, as well as ritual and funerary items, such as silver libation dishes (used for offerings poured in honour of a deity) and alabaster vessels for perfumes and ointments.

 

Heracleion, the ancient Egyptian port city that collapsed beneath the sea.

 

The "wickedest" city of the New World

 

Port Royal, in Jamaica, was once the most important commercial center in the New World. The town, “commonly referred to as "the wickedest city on earth", conjures images of marauding pirates, daring naval conquests, looting, riches, destruction and devastation,” according to the United Nations Educational, Scientific and Cultural Organization (UNESCO).

It began as a strategic cay used for cleaning and refitting ships when the Spanish arrived in the 16th century. Following the English conquest in 1655, it quickly developed into a fortified city and flourished as the principal commercial and naval port of the English Caribbean. Its economy thrived on the slave trade, sugar, and privateering—and it gained notoriety as a lawless paradise of alcohol, money, and sex, where one in four buildings was reportedly either a bar or a brothel.

 

 
 

Old map of Port Royal. Credit: The Gentleman’s Magazine / Wikimedia Commons

 

Excavations have revealed that beyond its many taverns, Port Royal also featured workshops, homes, and warehouses. The city stood out for its wealth and its prominence as a key center of trade and piracy in the Caribbean. In 1692, a devastating earthquake caused two-thirds of the city to sink into the sea. Subsequent fires and hurricanes thwarted any attempts at full recovery. Although Port Royal persisted as a British naval base and secondary port, it never regained its former status as a thriving hub of commerce and piracy. Today, it survives as a small fishing village in Jamaica.

 

El Palacio de Velázquez, ejemplo de la construcción industrializada 

Este emblemático edificio de Madrid fue rehabilitado por Sacyr hace 15 años. Luis Esteban, que participó como jefe de obra en aquel proyecto, nos cuenta su importancia para hacer avanzar las técnicas constructivas a finales del siglo XIX. 

Luis Esteban
Director Arquitectura en Sacyr Ingeniería e Infraestructuras

Se cumplen 15 años de la rehabilitación del Palacio Velázquez del Parque del Retiro (Madrid) por parte de Sacyr, en la que tuve la suerte de formar parte del equipo como jefe de obra. 

Los trabajos incluyeron la ejecución de una nueva cubierta y la restauración integral del espacio interior. Un trabajo desafiante ya que el edificio cuenta con Nivel 1 de protección con grado singular y está catalogado, dado su valor histórico y artístico.

Fue la primera obra de Sacyr en el emblemático pulmón verde de la ciudad de Madrid y un orgullo para la compañía participar en la restauración del Patrimonio Nacional. 

 

 
 

Imagen del interior recogida de la cuenta oficial del Palacio de Velázquez.

 

El Palacio de Velázquez fue inaugurado en 1883 como pabellón temporal para la Exposición Nacional de Minería, Artes Metalúrgicas, Cerámica, Cristalería y Aguas Minerales, que se celebró en Madrid ese año, durante el reinado de Alfonso XII.  

Su arquitecto Ricardo Velázquez Bosco le dió nombre al edificio y siguió para su proyecto el modelo que Joseph Paxton había establecido al proyectar el Crystal Palace de Londres. El diseño organiza una arquitectura amplia, cubierta con bóvedas de estructura de hierro, donde el cristal se usa para dotar de iluminación natural a los grandes espacios interiores.

Acabada la exposición el edificio, lejos de demolerse, paso a destinarse a Museo de Ultramar.  Hasta la actualidad donde pertenece al Ministerio de Cultura, quien lo dedica a sala de exposiciones temporales del Museo Nacional Centro de Arte Reina Sofía.

Pese a la antigüedad del edificio, tiene un curioso y actual nexo de unión con la arquitectura contemporánea. Las columnas de fundición, que pueden ser una de las más singulares características del edificio, podrían considerarse como los primeros ejemplos de construcción industrializada porque se fabricaron en taller.  Siendo por tanto una de las primeras semillas de la prefabricación e industrialización, que después de tantos años, se retoma en la actualidad con mucha fuerza.  

 

  


En este contexto de la construcción del Palacio Velázquez, es relevante indicar que la producción y exportación de hierro había crecido enormemente en España a partir de 1875, y con ello surgieron en Madrid las primeras fábricas de hierro (fundido y colado), desde las cuales se suministró al proyecto.

Todo ello permitió que las columnas de hierro pudieran ser elegidas por catálogo y llegaran a la obra completamente terminadas, solo esperando a ser colocadas. 

El éxito de este edificio le supuso al arquitecto Velázquez el encargo de otros edificios importantes como la Escuela de Ingenieros de Minas y el Palacio de Cristal del parque del Retiro, donde continuó usando soluciones de estructuras metálicas de hierro fundido con el empleo añadido de grandes lucernarios.

Let's do a mid-term recap of Sacyr Circular Transformation series!

In this series we explore projects where we're implementing circularity initiatives, along with the people involved.

Earlier this year, we launched the "Circular Transformation" series to highlight initiatives that aim to promote circularity, directly from the people leading the charge.

We're prioritizing the use of sustainable materials, preventing waste generation, and increasing reuse and recycling to create new forms of value.

Now that we're halfway through the campaign and the year, we're taking the opportunity to compile the initiatives from the series that we've published monthly. Our performance in Circular Economy has allowed us to reuse, recycle, and recover more than 23 million tons of waste since the beginning of 2020.

Here are the initiatives from the Circular Transformation series!

Treatment of the water used in the tunnel excavation at the Port of A Coruña

Tunnel and gallery excavation requires water for the machinery to drill through rock. To reuse this water, we've installed two treatment plants at the expansion project of the access to the Outer Port of A Coruña (Spain), which we are developing for Adif.

After treatment, we discharge it into natural flows, reservoirs, or the sea, where it can be used for industrial purposes.
 

 

A brine collector that extends the life of materials in the Llobregat Basin

We have renovated the facility with a new brine collector of 8.7km and 184 liters per second capacity. During the project, we recovered polyethylene pipes from the bypasses of the work and pavement milling so that the city council of Sallent (Barcelona) can use it in future works.

With these initiatives, we improve environmental protection, modernize infrastructures, regenerate water, and improve mining activities.

 

Reused Materials at the La Llagosta Logistics Terminal

We are developing the construction of the La Llagosta (Barcelona) international logistics terminal for Adif to turn it into a strategic logistics hub on the Mediterranean corridor.

The project stands out for the reuse of asphalt pavement, ballast, and concrete debris, which allows for a positive environmental impact and cost savings by reducing the consumption of new materials.

 

Circular Initiatives in Madrid Construction Projects

We manage sacks, recycle plasterboard, and reuse pallets. These are some of the initiatives we are carrying out in Madrid to minimize the environmental impact of our construction projects.

 

Zero Waste Certification for Our Hospitals in Chile

Our best practices have allowed us to obtain the Zero Waste distinction in the Sótero del Río, Provincia de Cordillera, and Buin Paine hospitals.

Obtaining this certification reflects the full alignment of the projects in Chile with Sacyr's Zero Waste Plan, which seeks to achieve 80% of waste reused, recycled, and recovered annually.
 

 

Circular economy as an economic model to fight climate change

Prioritizing materials with recycled content, working with local suppliers, and properly managing the waste we generate are key factors in reducing emissions.

Through this approach, we have managed to reuse, recycle, and recover 92% of the waste generated in Sacyr's activities in 2024.

 

The Zero Waste Plan is the vehicle for achieving our circular economy goals and guides our steps in this area. With the impetus of the plan, we have avoided the emission of 10,000 tons of CO2eq since 2020 and expect to reduce 15,000 tons of CO2eq by 2030.

Until the end of the year, we will continue to showcase Sacyr's circular economy projects. Follow us closely on our social networks and don't miss the upcoming content of Circular Transformation.

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Green hydrogen to reduce construction machinery emissions

We’re developing a pilot at the Sótero del Río hospital project in Santiago de Chile to apply a renewable fuel that improves environmental performance of the machinery used at our projects.

The new Sótero del Río Hospital (Santiago de Chile, Chile) is bound to be one of the largest healthcare facilities in Latin America, and also one of the most sustainable. This project, developed by Sacyr Engineering and Infrastructure, has obtained the Zero Waste certificate, and is now conducting a novel pilot to introduce a hybrid boom truck fueled by green hydrogen into its fleet. 

The aim is to improve the efficiency and reduce emissions produced by diesel trucks by implementing a hybrid green hydrogen injection system into the combustion chamber.

 

 

The new dual combustion system has been designed in Italy specifically for this vehicle model, as it is the first time it has been implemented in a boom truck. The installation of this kit was carried out by AndesH2, a company that has experience in Colombia and Chile. 

"This innovative project arose from the urgent need to reduce the emissions generated by the equipment used on site. Considering that, in the long term, we must focus on progressively forming and shifting a fleet of heavy equipment with zero emissions, including hopper trucks, backhoes, trucks with lifting equipment, among others," explains Rodrigo Fernández, Construction Manager at Sacyr's Metro L7 in Chile.

"Our main purpose is to evaluate the technical and economic feasibility of the gradual conversion of Sacyr's current fleet to low-emission equipment, thus ensuring compliance with more rigorous environmental standards and actively contributing to the sustainability of the sector," Rodrigo says.
"Our goal is to evaluate the benefits of introducing synthetic fuels such as green hydrogen," explains Etienne Valdés, R+D with Sacyr Chile's Innovation Department.


 

 

The project consists of the implementation of a dual combustion system designed in Italy specifically for the truck model. The installation of this kit was carried out by AndesH2, a company that has experience in Colombia and Chile implementing these modifications and being the first time that it has been carried out on a boom truck.

This process is called dualization or blending of green hydrogen to improve fuel efficiency. The installed kit is connected to the hydrogen tanks and injects the appropriate hydrogen percentages into the engine.
 

 

Preliminary first tests have already been carried out using 4 kg of hydrogen for a week in a controlled setting closed to traffic.

"It takes less hydrogen than diesel to reach the same energy efficiency in the engine. The engine is modified to inject 15% hydrogen on average into the fuel. This improves efficiency and reduces the use of diesel, so the engine is more efficient, and produces fewer emissions," explains Etienne.

The use of this fuel poses further challenges. "We have to create a safety plan with this equipment, and, as a second step, homologate the truck for use on public roads. Currently, we are managing an experimental permit certificate through the Ministry of Transport and Telecommunications, explains the expert.

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