Jill Heinerth was wriggling through a narrow crack in the underwater cave when claustrophobia caught hold of her dive partner. The January 2011 dive was her first with Ruth, a twentysomething marine ...

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Jill Heinerth's Into the Planet starts with the world-renowned cave diver almost dying while being one of the first humans to search for caves inside the B-15 iceberg, the largest moving object on ...