National Geographic - Drain the Ocean

Part 1
https://www.youtube.com/watch?v=HVJNLSwCGHc

Part 2
https://www.youtube.com/watch?v=1q6JOkR_914

Part 3
https://www.youtube.com/watch?v=ljvaJZG49L4

Part 4
https://www.youtube.com/watch?v=LOaH6usId30

Part 5
https://www.youtube.com/watch?v=ydKJ8dvhvnw

Part 6
https://www.youtube.com/watch?v=uO3EzwHAUes