DWS 4+ S0/S2
From the LHS of the Outer Pinnacle (facing out) traverse the slab 4m above the water until a committing move gets you above the entrance to the sea cave. Traverse along the top of the wall barring entrance to the cave, descend a crackline and move left into the blowhole. Entertaining squirming gets you back to the ligth of day.
Variation: do a low level traverse to start, until at the entrance of the cave and move up the crackline and then left along the barring wall and continue as described.