The G7 Cornwall logo looks suspiciously like the Terramar logo. "Watch the water..?"
Helium / oxygen mixture is used in deep sea diving, to reduce the risk of the bends or nitrogen poisoning.
Highly unlikely for deep sea repair divers to use it all. But if something was being built underwater, that's another story…
Shingles is the chicken pox virus. Did he have chicken pox as a child?
I concur, seems reasonable.