Quotes from the news wire:
We are listening to their respiratory pattern. We may hear a little gurgling in their diving apparatus, indicating water intrusion in their helmet, we know each other well. We are listening to the tone of their voice ... the words they are saying. We are listening to their opinions, we are listening to the factual information. We are listening to every single word they say and every breath they take to make sure they are safe on the bottom.
Trust in sending that person down below the water line to accomplish the mission, to repair a ship, you consider the fact that we send our divers down to replace 55,000-pound propellers on a submarine, and we send that submarine to sea to go out and support our combatant commanders on that one person's or two people's word that that ship is ready to go. That's an immense amount of trust.