I recently walked into West Marine, a Very Big U.S. retailer of marine sailing goods. I still do not see any radios that can compete with the Icom M32 for submersibility in the price range of under $500 USD.
The icom M32 and M32-LI are the only ones that I see that have NO Through The Case mechanical control knobs.
Here is an updated version of the BAGEA endorsement.
See me dunk my radio for 40 minutes Bill and Gary's Excellent Adventures GARY