"On 15 May 1969, Guitarro was moored in the Napa River at Mare Island Naval Shipyard while construction was still underway. At about 16:00, a civilian nuclear construction group began an instrument calibration assignment which required the filling of certain tanks, located aft of the ship's pivot point, with approximately five tons of water. Within 30 minutes, a different, non-nuclear civilian construction group began an assignment to bring Guitarro within a half-degree of trim; this entailed the adding of water to tanks forward of the ship's pivot point to overcome a reported two-degree up-bow attitude. Until shortly before 20:00, both groups continued to add water, unaware of each other's activities."
Source: https://en.wikipedia.org/wiki/USS_Guitarro_(SSN-665)
"On 15 May 1969, Guitarro was moored in the Napa River at Mare Island Naval Shipyard while construction was still underway. At about 16:00, a civilian nuclear construction group began an instrument calibration assignment which required the filling of certain tanks, located aft of the ship's pivot point, with approximately five tons of water. Within 30 minutes, a different, non-nuclear civilian construction group began an assignment to bring Guitarro within a half-degree of trim; this entailed the adding of water to tanks forward of the ship's pivot point to overcome a reported two-degree up-bow attitude. Until shortly before 20:00, both groups continued to add water, unaware of each other's activities."
Source: https://en.wikipedia.org/wiki/USS_Guitarro_(SSN-665)
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