Recently a photograph appeared on the Internet of the propeller on an Ohio-class ballistic missile submarine at Trident Submarine Base in Bangor. A key to the submarine's ability to deploy and remain undetected, propeller designs have been kept under wraps for years, literally. When out of the water, the propellers typically are draped with tarps.
The propeller image appeared on Microsoft's mapping tool, Virtual Earth. It was discovered accidentally by Dan Twohig, a deck officer with the Washington state ferry service who was using the program to examine real estate on the west side of Puget Sound.
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