Most early underwater habitats lacked regenerative systems for air, water, food, electricity, and other resources.

There have been numerous underwater habitats designed, built and used around the world since the early 1960s, either by private individuals or by government agencies.

Sphere, a novel that takes place in an underwater habitat.

Sealab is a word used to describe underwater habitats.

There are many activities that could destroy these underwater habitats.

The work will disturb large areas of underwater habitats.

Maybe what the cameras saw are really submarines, giant mobile underwater habitats.

There was some damage to the underwater marine habitat.

They had been transported down earlier by the diving bell, which served as an elevator and underwater habitat for the dive team.

This freshwater fish is found in small group in all sorts of underwater habitat.