I'd imagine somewhere in the deep ocean there was a conversation when a boat using this gadget passing by ....
<sonar operator> Capten, we're having problem tracking this new stealth sub in front of us, this pesky sound from the yacht above us is jamming our sensor ...
<skipper> God damn it, just blow sob sky high, nobody knows since we're in the middle of nowhere anyway ... <with big grin at the face>
<sound from the intercom speaker> Torpedo is now loaded ...
<warfare specialist> : Yacht impeller sound signature is locked and secured
<skipper> : WHADAYA WATING FOR !!! Press that farking big red button now will ya ...
Sorry, can't help it, its just I watched too many subs movies.