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. Love Tumble? Leave us a review on iTunes! Want to be on the show? Send us a question! Record yourself asking the question, and tell us what you think the answer is and how scientists might find the answer. Would you support Tumble? Donate on our website, www.tumblepodcast.com.