User blog comment:BannedLagiacrus/Discussion of the Week: Underwater/@comment-4899131-20170412205151

As Tri was my 1st game, I have quite a lot of affection for underwater. I really enjoyed the challenge of learning to play the same game in 2 quite different ways. So yes, I would quite like to see it back some day.

Longsword was probably my favourite weapon to use underwater, the fluidity of it suited the environment & was awesome against Ceadeus. Got on well enough with my usual hammer & SA too, and found both GS & lance pretty good v Ceadeus. Didn't use much else underwater, so can't really say I have a least favourite.

Wear an aqualung with an hour's supply of air!

I thought both Lagi & Ceadeus were great, but my favourite has to be Gobul. I play as Steve Irwin & the 1st quest I failed in Tri was the giant stingray type thing! It was also one of the monsters that got me into hammer, so Gobul will always have a special place in my heart. Least favourite is probably Plesioth, more by default than anything as I just like the other underwater monsters better.

As Blazing Black Dragon mentions below, some kind of giant shark would be cool & all the suggestions here for existing monsters underwater sound good too. I do have to wonder if some kind of underwater Mohran would be feasible?

Aqualung, see above. Seriously though, I'd be very interested how boomerangs & cats in general worked underwater.

Favourite places to hunt were Underwater Ruins & Deserted Island, plenty of room to move around. Therefore rooms 5 & 6 of Flooded Forest were not places I enjoyed.