In case you didn't know, it appears that an Oxypen restores a 24 minute supply of oxygen.
Just TESTed: had 12 minutes of supply left, then used 1 Oxypen and got 36 minutes; then used one more Oxypen and got 1 hour supply.
P.S. We need Beerpen introduced into the game, so that we can TEST it
Just TESTed: had 12 minutes of supply left, then used 1 Oxypen and got 36 minutes; then used one more Oxypen and got 1 hour supply.
P.S. We need Beerpen introduced into the game, so that we can TEST it