I can't find entrance to Marten's Tomb in Sea Caves.
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My Status is: i've got Marten's Tomb key, placed wooden plank over the breach, but when i try to go farther, i'm just sliding away. Any ideas?
Thanks.

Since you have the tomb key, you've already been clicking on skeletons. One of the bodies has spiked boots. (Pause). Wear the boots on any character to stop sliding around.