This movie shows the completion of Europe's first underwater restaurant, designed by Snøhetta, as it is submerged off the coast of Båly, Norway.
Snøhetta constructed Under on a barge 20 metres from its final site over the course of six months, before it was manoeuvred and sunk in July 2018.
The time-lapse footage condenses the final day of structural work on the 495-square-metre building as it is submerged like a "sunken periscope".
Under was constructed on a barge 20 metres from its final site
Under takes the form of a concrete tube fronted by a large panoramic window. Once its structure was complete, watertight and weather-proof, it was lowered into the sea.
It was then delicately moved to its final location with the use of a crane and tugboats, and positioned above its final site. Snøhetta then flooded the structural shell with water to resist buoyancy, allowing it to sink to the ocean floor five metres below. The building is now secured to a concrete slab with 18 bolts, which is anchored to the bedrock beneath the seabed.
"In order to ensure a proper connection to the bolts on the concrete slab the construction team filled the structure with water to make it sink," the architecture and design studio explained.
"After ensuring that all bolts were fully tightened, the water was drained away, allowing the interior work to begin."
The concrete shell was later flooded so that is sunk to the seabed
Under's walls are slightly curved and half-...