Every Giant Sea Creature Explained in 82 Minutes

Every Giant Sea Creature Explained in 82 Minutes The leatherback sea turtle is not just the largest turtle alive. It's a living submarine built from ancient blueprints. Carrying the weight of 100 million years on a shell that isn't even really a shell. This creature can grow up to 7 ft long and weigh over 2,000 lb, making it heavier than most grand pianos and longer than most humans are tall. But here's what makes it truly different.