Where is the deepest part of the ocean, and have we been there in person? Ocean explorer Gaelin Rosenwaks answers with an amazing story of the first explorers to dive to a mysterious place called Challenger Deep. It's filled with awesome adventure, incredible risk, and awe-inspiring reward. This is a journey that changed the way we understand the ocean. We're working on a bunch of exciting new stuff for you this week, so we are re-playing one of our favorite episodes.  Love Tumble? Subscribe on iTunes! itunes.apple.com/us/podcast/the-t…cast/id984771479 and write us a review. Support us on Patreon! www.patreon.com/tumblepodcast And visit us on our website,www.sciencepodcastforkids.com