4:10 / 14:18 The people being able to breathe . . .:
What they have on board, they have air for about 4 days. And also, they have a scrubber system similar to what they have on spacecraft. That converts CO2 back into breatheable air. They also have backup scrubbers. They also have, for final emergencies, SCUBA tanks beneath the floorboards.
4:41 / 14:18 Drinking water . . .:
One of the things that has not been mentioned, is how much water they have. The human body can only survive about 3 days without any water. . . They each only took along a canister of water. The dive itself was meant to last about 8 hours. 2.5 hours descent; 3 - 4 hours observation at depth, near the seabed; 2.5 hours ascent. They lost communications around 1 hour 45 minutes.
5:38 / 14:18 According to 1 report . . .:
They have 7 types of redundancy systems on board. They can re-float this vessel, if they get into trouble. And numerable of those systems work, if there is a power failure. If lights go out, and there is no power, they can still resurface this vessel. There are weights that they can drop, to create buoyancy. There are propellors that point up, in order to push the vessel up. There are airbags that can be inflated, in order to lift the vessel to the surface.
Now one idea is, that the vessel has surfaced, and it is bobbing around, waiting to be picked up. Possible, but unlikely; if on the surface, they could use radios in order to communicate. They might only have VHF and shortwave radios on the vessel. [His previous remark about they're not having radio - he apparently meant, no radio communications at depth.]
If power was lost, scrubber’s don’t work.