By a twist of fortunes, the kelpie that nearly drowned Blaise ended up leaving behind a clue that overcame the hurdle of being stymied by the many sea caves on the East End Point. A lock of oily dark turquoise hair braided with sea glass, beads, and an old French golden franc. Old Zef was able to date the coin, determining it must have been minted around the time that Francois L'Ollonais would have concealed his treasure on New Providence Island. The kelpie had been to the sea cave with the treasure cache. All that remained were sharp eyes, knowledge of the sea, and a strong paddling arm to track the kelpie's movements; a silhouette beneath the waves there, a flurry of fish there, a dip of a tail amidst the foam, and your party came to a ceiling with a low lip at the entry.
There is no further sign of the kelpie who seems to have swum off after realizing she was being pursued by canoe.
It is nearing sunset when you find it. The exterior has the same unintelligible swirling inscriptions that Nia had noticed on the cliffside before. Etienne would ferry you over in two groups.
The interior of the sea cave is humid and dark; light will be necessary to see much further in, save for Old Zef who sees just fine. Old smuggler's ropes overgrown with algae and rotted piers confirm you've found the right cave.
Echoes of churning water on rocks signal a growing tide, likely to peak around midnight and make the entry of the cave too low for even the canoe to get out. In between the swells there is a clicking sound amidst the drip of water from stalactites. Washes of white salt cling to the algae covered rocks. The chamber is some 20 feet by 20 feet large, its ceiling low enough along the sides so that the tallest of you need to lean forward to avoid scraping your heads. The water becomes shallower the deeper into the cave you go till it's only about human knee high. Plentiful jagged rocks provide mooring sites for the canoe.
To the left, a low-ceilinged passage suitable for single-file movement wends through the rock for 20 feet before hooking to the left and obscuring sight. The water is about knee high along the passage.
To the right, a 10-foot wide passage rises out of the water via natural stone steps, leading toward a chamber to the north where the clicking sound emanates from.