Has Logan ever been submerged in water, lava, acid or anything else for a period of time? If so did he remain operational during that time, or did he pass out until his skeleton was removed? Question is for all universes.
At the end of X-Men: Days of Future Past, Wolverine is lifted up from the bottom of the river (most likely Potomac because it's in DC) on a boat. It's unclear how long he's been in the water, but he's unconscious and has been probably under the surface for at least some time. The crew is guided by Col. Stryker, likely for his experiment to convert his skeleton to adamantium. I've never read the comics. But it's definitely in the movie canon.