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together is going to be critical. reporter: the materials used here and their designs are tried and tested. other designs like tubes, for example, you have to make them extremely strong to handle the force. the wonderful thing about a sphere, when you push it, it wants to stay that shape. reporter: this 7-inch-thick sphere with the crew capsule of the alvin submersible as it carried the first humans to the titanic wreck. it s been redesigned for current missions, an exacting collaboration with the navy, but basic principles haven t changed. how much thought about safety went into this? oh, my god. that is literally step one. we have fire extinguishers, we have emergency food. we have water. the sub is built around the idea that we have to come home. reporter: the crew capsule and everything on board the deep diving submersible, even something as small as a camera housing, is pressure tested. if it s a piece of alvin equipment that gets tested.

Principles haven tAlvin submersibleEmergency foodFire extinguishersCamera housingDeep diving submersibleAlvin equipment