Absolutely Glitched Cave. (Eurvicscire)
This bugged cave in Assassin's Creed: Valhalla (Anlaf's Lookout) is totally broken. Invisible water you can swim in! If you can't find your way in this cave because you're floating in mid-air, try:
— using Eagle Vision to find your way in the dark
— using melee attacks to get inside the cave with the treasure chest
— grabbing the treasure chest and Fast Travelling out