Bit of an aside, but Dräger is a fascinating company. Aside from their core medical devices, serious scuba divers know them for their rebreathers, which collec

Bit of an aside, but Dräger is a fascinating company. Aside from their core medical devices, serious scuba divers know them for their rebreathers, which collect, scrub and reuse the air you breathe, instead of just venting it out like typical scuba regulators. Rebreathers are notoriously expensive, fiddly and dangerous, because there are all sorts of ways things can go wrong if the gas mix isn't just right, but Dräger's kit is the gold standard. https://en.wikipedia.org/wiki/Rebreather https://en.wikipedia.org/wiki/Rebreather