Stuffing a "normal" submersible unit into a separate save-a-butt dry cylinder is probably significantly cheaper than trying to come out with a standalone handheld that can handle dive depths.
You have speaker/microphone transducers, tuning dials, volume/squelch, strobe on/off, power to deal with. Even a relatively "cheap" case, like the 40m-rated Oly camera cases, runs what, about $150? Handheld form-factor is also a bit "odd", not too conducive to a form-fitting case, due to the antenna sticking out of it.
A normal submersible-rated radio, that can handle 1.8m submersion to get you through wave splash kinds of events, coupled with a low-cost cylinder storage case, is likely much less costly.
Curious -- would a decent diameter PVC pipe piece, permanently cemented at one end, screw thread at the other, do the trick? Looks like it would need a tube with a 3" ID.
You have speaker/microphone transducers, tuning dials, volume/squelch, strobe on/off, power to deal with. Even a relatively "cheap" case, like the 40m-rated Oly camera cases, runs what, about $150? Handheld form-factor is also a bit "odd", not too conducive to a form-fitting case, due to the antenna sticking out of it.
A normal submersible-rated radio, that can handle 1.8m submersion to get you through wave splash kinds of events, coupled with a low-cost cylinder storage case, is likely much less costly.
Curious -- would a decent diameter PVC pipe piece, permanently cemented at one end, screw thread at the other, do the trick? Looks like it would need a tube with a 3" ID.