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There is while you're at work. I work at PepsiCo (my views are my own, standard legal disclaimer yadda yadda) and there's no requirement that I must consume only Pepsi/Frito-Lay products all the time. But when I'm at work, I would have to be a complete idiot to bring in Pringles and Coke for lunch. Same goes for work-related events or meals, which nearly always held at a "Pepsi pour" location. It's just good business.
We're obviously encouraged to visit Pepsi pour locations on our own time, but nobody's following us around with a clipboard. Even at work it's not a formal rule, there's just a very strong cultural taboo given our good-natured rivalry with that carbonated beverage producer in Atlanta...
Also, they have their own 5,000 sq ft data center in the stadium. Pretty cool, but I think I'll still wait until the game's over so I can watch the commercials online in one go!
Yes, SCUBA tanks (in the U.S.) are supposed to undergo annual visual inspection (basically an interior/exterior idiot check for bad rust, chips, cracks, beat up valves, etc) as well as hydrostatic testing every 5 years*. The cylinders most likely to have a catastrophic failure (typically the neck) were a bunch of aluminum 80's manufactured something like 30 years ago. Back when I worked in a dive shop we would do an eddy-current test on the necks of ALL aluminum cylinders during the annual visual inspection even though it was only really necessary for the one batch. If you take halfway decent care of a tank and don't let moisture get in (by draining the tank too low), they'll last for ages. We had decades old steel cylinders in our rental fleet that had probably outlived many a valve!
The concern is probably warranted but I would imagine the auto industry's safety measures will be far greater than those of the average diver. If the vehicles only go in for maintenance once every few years, the tanks ought to be fine. I would worry more about them being punctured during a collision. Frankly though, assuming they've done at least a minor amount of planning with collisions in mind, the severity of a collision strong enough to puncture the tank would make a sudden release of pressure the least of your concerns.
* Disclaimer: I've been out of the dive industry a while, my numbers might be off.
... it gets dark pretty quick down there. Even at 100ft/30m you've lost a lot of the color spectrum. So they'll take a lot of lights with them. Okay, fine. Don't expect any sweeping vistas -- the background's going to be black.
What are they going to film for Avatar 2 that they can't film a few thousand feet shallower? Neat rock outcroppings? The only thing I can think of are bizarre critters, which will be done in CGI anyway.
I'm all for exploring the depths, but whoever said the Avatar 2 angle is a tax write-off was dead on.