Not intentionally, and it is not actually a prison, but the lower levels of Rikers Island (the primary jail of NYC) do flood when the East River rises.
An underwater camera, is a camera that works underwater.
Underwater landslides, Underwater volcanic eruptions, and Underwater earthquakes
underwater
Yes. Underwater can be used as an adjective and an adverb. adjective: underwater expedition adverb: swim underwater
14 underwater Webkinz and 5 underwater Lil'kinz =
because they are
Plumbing underwater
An underwater technician would be a person who was capable of fixing things underwater.
To do the underwater challenge in Peru, YOU HOLD YOUR BREATH UNDERWATER DUMMIES
was car underwater
A car that you can drive underwater
Underwater Cameras