hydrophone
hydrophone is a microphone.
Overview
Underwater microphone.
In detail
It is recorded in the collection of subaquaria.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Hydrophone”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q798062: hydrophone
Consult the source