OK, so I was messing about on Outset Island, doing random glitches, when I did an upwards ess against the far left wall of Outset Island, right of the small grass patch with a pig, and I clipped through the wall and superswam (superswimmed?) through the ocean. It would be awesome if it is useful! Thanks for reading.

EDIT: For the item slide I moved the stick down, paused, held an upward ess, and paused. Sorry for the clarification issues.