A term used primarily by some navies for nuclear submarines, termed "true submersibles", because they cannot retroactively declare that their non-nuclear submarines should be called by a different name
A very small "baby" submarine designed for specific localized missions, usually while tethered to a submarine or ship for life support and communications. Slang synonyms: midget-submarine, anchor
If something is submersible, it can go or operate under water. a submersible pump. a small vehicle that can travel under water, especially one that travels to very great depths in the ocean for scientific purposes
a warship designed to operate under water an apparatus intended for use under water capable of being immersed in water or functioning while submerged; "a submersible pump"; "a submergible electric frying pan
A mini-submarine that's used by scientists to go down deep into the ocean for research A famous one is the Alvin that's operated by the Woods Hole Oceanographic Institute in Woods Hole, Massachusetts