If memory serves me, initially it said that area had been chained but someone had cut the chain (not these divers).
Either way, reports keep repeating that area was off-limits. Read the first and sixth paragraph of this report:
http://www.miamiherald.com/884/story/45198.html Just about every report is saying they were in an area they weren't supposed to be. Your second to last post states the friend knew they were doing the Pump-room. So they knew they were doing an area they were not supposed to
I asked a question earlier of someone, I was wondering if it is standard protocol to weld, to chain, or both. That was just a curiosity of mine.