Bottomless Lake

Bottomless Lake was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the portable Animus HR-8.5.

Riddle
''Taking the plunge? Everyone on the island thinks this is the deepest dive, but there is a take in the Coast of Koliadai that is rumored to be botomless. If you are able to dive as far as the woman in marble, you will be able to claim me.''

Outcome
Kassandra found and recovered the treasure.

Reference

 * Assassin's Creed: Odyssey