A ship carrying valuable cargo was attacked or just sunk due to unfortunate weather. However, the (undead?!) crew managed to salvage most of the cargo to nearby caverns. The players might want to loot the wreck out of sheer greed or perhaps the ship was carrying a cargo that was imperative to whatever world-saving they’re doing.
For foes, you can use whatever aquatic creatures you want or as I initially, thought, let the ship have an undead crew that is still patrolling the area and guarding the cargo.
However, be careful not to disturb the kraken!
Here’s also a black and white version.
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