[ExSoldier]

The Chinese don't have to come straight from China, they're all over Panama and Cuba and a few other areas. I'd have to see a rig up close to give you an idea and while I don't have any experience like you have, I DO have an ill spent youth hanging around a lot of specops guys who do those sorts of things. My high school and college buddy was just up the road in a Ranger Battalion when I was a straight leg infantry officer and those bad boys sorta adopted me. They in turn introduced me to some SEAL types and Special Forces folks.... and at the officers club and other sundry party activities, they spoke and I listened... So I'm certain it can be done. MAYBE submerged? A shaped charge that could start such an explosion? I'd have to see a detailed pic, maybe. Ask Travis McGee. HE is the expert. How about it, Travis?

[Travis McGee]

It’s an easy op. But I expect it’s a legit accident. One blew up in the North Sea about 20 years ago that made this one look like a firecracher.

[TWfromTEXAS]

Well my dear old grand dad was a Navy officer, Rice grad, helped the CIA pick up that Russian sub in the 70's, Cameron BOP salesman and VP of Global Marine. My dad served in the Army and can blow you up 10 ways with things found around the house, spent some years on rigs and has sold drilling equipment for 40 years.

I just punch computer keys but I assure you there is no way to cause a blowout, underwater, when the pipe is full of mud and or cement. This is getting foolish and no one here associated with the industry thinks it can be done.