Oxy Stick

I’ve had this idea for a while, basically a futuristic oxygen candle that works like a flare and saturates water in a small are with oxygen for a short time. It would serve as a bridge between oxygen tunics and the tadpole. Give the player a taste of the kind of planning required to survive, and what happens if they underplan. Caves in the shadows could be expanded to be a bit bigger and windier, to really sell the desperation of searching for an air pocket after running out of oxygen flares. They could also replace oxygen bubblers in Axum infrastructure

I think there is already something sorta like this. The air bladder contains (I think) like 30 seconds of air. If you pack 4 of those in your inventory thats two whole minutes of air.