Observatory (Subnautica)
The Observatory is a small glass room that can no longer be obtained legitimately in the game. It is a medium-sized glass box with two entrances on each side. The Observatory seems to have oxygen inside of it, even though there is no way for oxygen to be inside and no way to renew it. The Observatory is very lightweight, and even fish can move it.
The Observatory's primary use is to observe life forms in their natural habitat. Although this method is safer than swimming outside unprotected, it is very difficult to move without the use of Floaters.
Gallery
If placed on a Foundation, the observatory cannot be moved by fish.
Observatory model from Sketchfab