This week we're replaying some of our favorite undersea episodes. In this one from November 2020, scientists determine that the Greenland shark lives longer than any known invertebrate, up to 400 years. How? We don't know, but it sure does seem chill about it. Plus: UK-based artist Sue Austin developed an underwater wheelchair, making the wide, wide sea a lot more accessible.

A Greenland Shark Living Today Could Have Been Alive in 1620 (HowStuffWorks)

A Specially Adapted Underwater Wheelchair Brings Artist Sue Austin Beneath the Earth’s Surface (Colossal)

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