Check for things in the way such as small fish. If one or more is in the way kill it and the cage may rise up.
If it still remains stuck (which some players have encountered) you have a couple of options:
1) Reload from a previous save and try again
2) E-mail me your zipped, save game and I can hack you a 2nd Tablet (which is the only item found past the crab cage)
Good luck!
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<b>Xignal</b>
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