There's two huge problems with this.

1) The Na'vi have no way of knowing what is at the bottom of the ocean, since they do not possess the technology to do so.

2) This means that the humans would have to build a submarine. That would take the entire length of the movie to do, and they do not have the proper schematics to give to the fabrication plant to get it to make the parts they would need.

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Official Field Guide for the Olympia Camping Trip!