Following news that Europe's first submarine restaurant has become covered in marine life, we've rounded up seven examples of underwater architecture.
From a research centre set to be built on the ocean floor to a holiday home that looks out directly to the sea, architects are creating numerous structures that are submerged under water.
With awareness and environmental concern mounting over the impact human activity has on the planet's oceans, many of these structures are designed to help people appreciate the importance of marine ecologies.
Here are seven underwater buildings and proposals that demonstrate what is possible when building under water:
Aptly named Under, this restaurant is submerged in the North Sea water that surrounds the remote Norwegian village of Båly. With a floor plan that spans 495-square-metres, architecture studio Snøhetta claims that it's the "world's largest underwater restaurant".
Designed to resemble a sunken periscope, the restaurant is made up of an exposed concrete tube fronted by panoramic acrylic windows. Alongside providing diners with a place to eat, it will be used as a marine research centre.
This private holiday villa in the Maldives has an aquarium-like bedroom suite encased in curved, seven-inch-thick acrylic walls where guests can observe marine life.
Named The Muraka, the underwater holiday home designed by architect Ahmed Saleem and New York studio Yuji Yamazaki also has a kitchen, living and dining area, and three bedrooms that are positioned above water.
Set to be built two kilometres from land at the Busselton Jetty in Western Australia, the Australian Underwater Discovery Centre was designed by architecture studio Baca Architects to mimic the shape of a whale surfacing from the sea.
Visitors to the centre will be able to look out of a large window onto the ocean floor where they'll be able to observe the marine habitats of Geographe Bay.
The ReefLine is a seven-mile-long underwater sculpture park being built by architecture studio OMA along the shoreline of Miami Beach. It will feature installations that can only be viewed while snorkelling.
The team of marine biologists, researchers, architects and coastal engineers working on the project hope that it will raise awareness around the negative impact climate change is having on coral reefs and rising sea levels.
The permanent installation forms the Underwater Museum of Cannes, which is designed to bring attention to the ocean environment and the impact human activity has on marine life.
Slated to open in 2025, Docking the Amsterdam is a museum in the Netherlands that will encase the wreck of the historic ship Amsterdam.
Architecture studio ZJA plans to build a glass tank around the 40-metre-long wrecked ship, allowing visitors to view it from all angles. They will also be able to learn about Dutch maritime history in the museum's exhibition spaces.
Swiss designer Yves Behar designed Proteus, an underwater pressurised research station for the Fabien Cousteau Ocean Learning Center – a French ocean conservationist centre.
Hailed as the ocean's equivalent to the International Space Station, it will play host to up to 12 researchers and aquanauts at a time. Scientists will be able to grow their own food in the station which is located 18 metres under the sea near Curaçao, an island in the Caribbean.