Well, actually it’s well in the SCUBA range. The record is 1027 feet. 200 feet is a lot closer to 130 feet than it is to 1027 feet. What makes you think that even a helmeted dive would be so easily detected? (Serious inquiry) Do we have monitors or patrol boats along even these cables?
Because they would have to "dive" from a surface vessel or a specialy equipped sub,in multiple locations,at multiple times, in the Gulf.It's not the diver so much as it is the delivery of the diver.We have ships and subs patrolling those waters, if you remember the Iranian speedboat "incident".The only thing we can't control is the Iranian waters.As in,they can do what they want over there,but it doesn't mean it isn't detected.
Hope that makes sense.