>-> This brings to mind something I saw up in that area (don't know what
 >-> but I'd guess it was in New Jersey, Delaware, or Maryland) about 30 y
 >-> ago:  On the approach to a tunnel, there were signs saying that vehic
 >-> with, or pulling trailers with, gas bottles were not to use the tunne
 >-> were instead to use an open-air route.  The driver of the car I was i
 >-> failed to acknowledge these signs, and we were pulled over and reques
 >-> take that other route.  Might some tunnels have less than optimum att
 > -
 > I've heard that some bottles of compressed gas can and
 > will explode
 > under the low pressures of going under the water, i've
 > also heard it
 > wont. But i dont take channses and just leave my
 > bottles, at home, this
 > goes for Propane, Nitrise Oxide, and compressed oxygen
 > for scuba tanks.
I don't even remember whether this tunnel was underwater, but in any case, 
there are lots of folks who use oxygen for medical reasons.
        >--->
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