Nearly died in a trichlorethylene tank when I was an apprentice. Had to be dragged out a bit sharpish.
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Used to use Trike as a vapour curtain in a large paint dip tank, which had rim extraction. Lethal stuff - apparently if a smoker draws the vapour through a lit cigarette, it turns to Phosgene, ie Mustard Gas as per WW1, with dire results.
Urban myth? Don't know, and didn't want to find out, but every annual shut down we drained the tank to clear paint pigment which had settled round the sparge pipes and a team of specialist cleaners would enter the tank using breathing gear to dig it out.
Sh*t Job!