Party submarine.

A battery-powered party submarine has been built in the Netherlands. U-Boat Worx has built a 35-metre battery-powered submarine that can dive to depths of up to 200 meters and is specifically designed to host the most "prestigious and memorable events on the planet." It accommodates up to 120 guests, not counting the crew. Inside the submarine, there is a restaurant, a gym, a water casino and even a water park, as well as a wedding hall. At the same time, no decompression is required during the ascent of the submarine: the air pressure in the lungs of each passenger is protected in an air-conditioned environment with full pressure.