What's the Name of That Book??? discussion

This topic is about
Stranger from the Depths
SOLVED: Children's/YA
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SOLVED. YA Sci-Fi: After a tsunami, researchers found a cave leading to an ancient advanced pre-history civilization on Earth. Spoiler.
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"After sleeping for thousands of years the last survivor of a lost civilization returns to life to reveal secrets of the earth's core never imagined."
The cover is pretty distinctive so you would probably remember it as well.
Two brothers found a cave after a huge tsunami devasted the coast. They found a sculpture made of something harder than diamonds. The artifact lead to a discovery of a cask holding the body of a non-human creature. After reviving it and establishing communication, the researchers found its civilization that was 100-million years old underground. At the end the memories of the researchers were wiped out and sent back to the surface or something.