Saturation Diving: A Good Day at the Office

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How are they using the green dye? For identifying differential pressure?
 
Ok, I'm sure it's not always as awesome as it looks but from my flat-assed desk job, that is just freaking awesome!
 
The dye, in the form of a chunk of luminous dye stick, is popped into the flange by the diver just before he buttons it up (tightens the bolts up) so that when it is supposedly tensioned to the pressures required for testing by the engineers, if there is any leakage, the dye is obvious. (Many times, when the flange is tightened, it will be wrapped in cling film so that if there is some leakage, the dye seeps into the cavity made by the cling film but isn’t washed away by tide, current, etc. So that a diver or ROV can swim along and check it long after the pressure test.
 
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