Toxicity — Cns O2

He gasped, sucking in thick, humid surface air. "I..." he croaked, his jaw aching. "I heard bells."

He blinked rapidly. The darkness of the wall seemed to pulse. He could hear a low hum, like a swarm of bees, vibrating in his molars. cns o2 toxicity

He was drowning in the very thing that kept him alive. He gasped, sucking in thick, humid surface air