From the way that Damien was said to have traveled as he dived we can conclude that the calculation that he travelled for -70 feet from the air pocket to the reef is wrong.
We are required to calculate the distance that Damien travelled from the airpocket to the reef.
The distance that the reef is can be said to be 0, then he is said to have climbed from that point 0 to where the air pocket is. He did this at a distance of -50
Hence we can conclude that he is incorrect because the distance that he travelled would be -50
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