[Hendrik nods ponderously; despite the faint joke to his question, there is good information to work with in Barbara's answer. He takes out his phone to again reference the request.]

The requester mentions these creatures only operate at night. We are already at a disadvantage without sound; should it be possible, we will want to lure these creatures to the surface.

[He doesn't think it needs to be emphasized how awful it would be trying to fight underwater with minimal lighting.]

Do you have any magic at your disposal?