I ended up taking a swim. Funny guy, this Fallout character. He can move unhindered with hundreds of pounds in rifles, and other cumbersome hardware, unhindered, yet can't hold his breath to save his life.
And those mirelurks are TOUGH!
Agreed.
One problem is that your lungs don't ache in proportion to how long you have been under water, as in real life.
Another is that I don't think boyancy is properly simulated, so as to at least give you a sense of where up is.
And of course one has to remember that time is accellerated in-game.
Mirelurks used to be tough. Now, two shots, max, into the face, with Gauss rifle, will kill it.
But Mirelurk Kings, they are still tough.