They had checked out the shipwreck with robotic ones, but now it was time to send a human down in a what?\nOptions:\n- rowboat\n- chair\n- school\n- submarine\n- internet cafe
Let's think now! Step-by-step reasoning:
User
Shipwreck is found generally under water in a sea. Humans can go down in a sea in submarine.
So, the final answer is submarine.
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