OK - other than the river crossings, what tunnel in the NYC subway could you get stuck in for days, and still be in the situation to use moist towelettes? Seriously? NYC subways are all "cut and cover" and are less than 20 feet down - and the whole right of way has emeregncy exits ever couple of hundred yards, and have air grates a lot closer than that

If you're stuck for a couple of days - you are either
1)In a river crossing
2)there are 1-2 spots up by Harlem that are deep
3)Or have a whole buildings worth of debris on top of you, and blocking the tunnel on both ends, and hint, even the WTC didn't take out the tunnel THAT bad (still lucky that there were no trains in the Rector St stop, but...

The Moist towelettes would most likely be useful for when yoy grab onto a handrail or a grab bar, and there was some "shmutz" on it