Not everyone is so lucky. Your anecdote shouldn't be used to justify throwing out safety procedures. In my case, a VIP would have caught the issues in the cylinder. It happens once in a while, and can be dealt with. I was unlucky with the cylinder had some issues. Lucky that it didn't igniteHere in Libya, commercial spearfisherman who spearfish on scuba in depth of 50 - 60 meters use 100% O2 for deco in bottles that were NEVER O2 cleaned at all! These tanks are very old and were never prepared for O2 service at all. No incidents so far with these tanks.