Drogyga is really the only underwater boss of the game. Definitely not my favorite of the game, but definitely not the worst of Metroid Dread.
Since you don’t have the gravity suit yet, you have to rely on other things to get you around in the boss fight.
It’s a lot of work to get all the water drained.
And of course, to get a chance to actually cause some damage.
It does take a lot of labor to put him down but I had my fun with it.