if i remember correctly, the sledgehammer is in or by a boat on the beach in Sea Caves (or maybe just the board you need is there) or in the caves somewhere...Marten's Tomb is definitely in the Sea Caves, you need the board and spike shoes to cross a hole. Sledgehammer only accesses a door you can't open until you've been in Marten's Tomb anyway. (it's the 'shortcut' out)
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