TUSA is a Japanese brand of premium dive gear. TUSA stands for Tabata USA, ironically.

I've had one of their dive knives. No problems with it either.

I also had the Gerber River Guide, but didn't like the sheath as it didn't feel secure.

I thought the Gerber Moray was pretty solid except it was too big for my liking.

The CRKT STIFF KISS is not too bad as a water knife unless you're in salt water.

I really like the Benchmade BM100 knife except the sheath is only
one way.

Ok, maybe I've bought too many 'water' knives in my time. Haha.