>>11175263 What does "condition 1SQ" mean? Several liberties were taken with the term for cinema's sake but it's short for "1 status quo" which means the submarine is ready to launch it's missiles. In Navy jargon, 4SQ means the lowest level of alertness for missile launch, essentially, a submarine is back at it's base.

Order #2 Set condition 1SQ means to prepare your battle station to the highest degree of readiness for action Example, the Hydraulic Control Station required a series of valve manipulations to take over control of the planes from the helmsman. Some of these valves had locks to prevent accidental operation. I had to remove the locks and set the valve lineup with the exception of the last valve which would cut off control hydraulics to the helmsman.

https://www.iwm.org.uk/collections/item/object/1060020463