A friend of mine was in the lazaret of an old small crewboat, fixing an exhaust leak. I happened to be on another boat dockside, when my deckhand yelled up to me that something was going down over there. My friend ended up going into a seizure (this rag-tag outfit we were working for didn’t have a confined space procedure) and the lazaret looked like the inside of a chimney. So, we managed to pull him out of the compartment, and grabbed an SCBA near by and put fresh air on him. Paramedics cleared him when they finally arrived about an hour later.