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Could we stay submerged. how long will that be, phil? >> if we have to, we can stay down here for three days. typically down for six to eight hours at a time. >> reporter: i presume if this goes to the surface, theres another crew that gets ready and come down. >> thats right. the submarine doesnt get tired, but crew does. >> its going to be pitch black. we have illumination provided by halogen lighting. it shows you what seems like a relatively simple task, under water with the issues of clarit...