> I have difficulty imagining accidental ignition in an underwater gas pipeline. Where would the oxygen come from? Plus it's more than one explosion on the same

> I have difficulty imagining accidental ignition in an underwater gas pipeline. Where would the oxygen come from? Plus it's more than one explosion on the same day - can't be a coincidence. There may not be a need for ignition; the news articles are saying pressures in Nordstream 1 dropped from 105 bar (1,522.9 PSI) to 7 bar (101.5 PSI). The water pressure at 100m where the pipe is is ~10 bar, so about a 1377.9 PSI difference in pressure. A pipe with 1,377.9 PSI difference pipe that's 1.1m in diameter rupturing seems like it would cause a blast even without igniting. I could also be way off-base. My physics and chemistry classes were a long time ago, and had nothing to do with explosions.