The ESA, Europe's equivalent of NASA, is constructing an underwater lab for training astronauts and conducting medical/marine bio research. Looks small from the outside, but the cross section reveals that it's three or four times the interior volume of Aquarius, probably the same volume as Conshelf 3 or Tektite. This is, for an undersea research enthusiast, a godsend. Between the confirmation that Poseidon Undersea Resort is moving forward, construction of the Sea Orbiter and now THIS, it's shaping up to be an exciting era for aquanauts. Some concept renders, a video tour, and under-construction photos below. As you'll notice it's designed to closely resemble a habitat lander, of the sort NASA intends to land on the Moon or Mars. It even has a down facing double door airlock to better simulate EVAs. I am particularly excited that it has a panoramic cupola identical to the one on the ISS. Should make for some stunning photo ops/footage.