Spiral Staircases for firemen

One might look at it that way, but there's another possibility to consider. Namely the presence of a fresh water saddle tank which straddled the firemans passage from above. If it was split open by the shock of the impact, the contents would have emptied into the tunnel fairly rapidly. Bruce Beveridge mentions the existance of this tank in "Olympic & Titanic, The Truth Behind The Conspiracy" on page 79.
 
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