BPs are really good at swimming and diving. it makes sense because the area they live in is quite tropical and not dry at all, so they can cross rivers and survive floods. most snakes also are really fast swimmers if they want to.
i would say its perfectly fine as long as the water temperatures are right and the water is good.
what i especially like about the video are the underwater tongue flickers, you can see them repeatedly, and how clean the water is and how well you can see it.
