What Is A "Green board"?
Old Submarine sailors often can be heard wishing
each other a
"Green board". What does that mean?
The "Green board" refers to the "Christmas
Tree" or Hull Opening
When this occurred the diving officer of the watch announced a
Since a "Green board" inferred a safe ship, and a safe journey,
the term is
Above can see the the old "Christmas Tree" panels in front of the trim station operator.
Above is the Ballast Control Panel of SSN651. The hull opening indicator can be seen in the red box. Below is a representation of the modern indicator panel. Dashed bars represent closed openings, Circles, open openings. A safe condition is called a "Straight Board".
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