I haven't played Minecraft in years, am giving it a go again. I got an Ocean Monument map from a cartographer. Sweet, never been to one. I got close, kept getting attacked, kept getting mining fatigue. So I found a nearby island and tunneled under the Ocean Monument. I eventually popped a cow in a boat and brought it along to cancel the mining fatigue every minute. I brought a ton of sand, and when coming up from under, started using the sand to clear out the water. Now, I've cleared a room, and by lucky chance one of the bad dudes swam in when there were just three water blocks left. Slice slice, done. It'll be a long haul, but I'm going to clear this thing from the bottom up.
I don't have any water breathing potions or gear, no fancy armor or anything. Just back and forth, back and forth, a few sand at a time...
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