Detecting sulphur deposits in the local cave systems. Sulphur is an essential component of the repair tool.
― PDA, Dialogue
The Safe Shallows Caves are multiple small cave systems found throughout the Safe Shallows, most too small to pilot a Seamoth through. While they can be a treasure trove of resources, they are also home to the Safe Shallows' sole predator, the Crashfish, making them fairly dangerous if one doesn't take caution while exploring them as they can easily kill a player without a Reinforced Dive Suit.