How deep in trouble are Mike and Josh this time? Five miles under the ocean! There they meet old foes, new friends, and some of the strangest creatures on God's earth.

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Before they can help put the bad guys in prison, they'll need to figure out the solutions to several puzzles, and sniff out the traitor in their group.

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Oh, and they'll also change the world with a new invention. All of this while learning to trust in God, obey their parents, and do the right thing.