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https://nationaltoday.com/national-submarine-day/
A submarine “day” lasts 18 hours and is split into three six-hour shifts. So a submariner may work for six hours and train, maintain equipment or sleep for 12 hours. What is the point of a submarine? They provide intelligence and underwater protection for surface ships and can detect and lay mines more efficiently than any other navy vessel ...
https://ask.metafilter.com/230592/Why-18hour-schedule-on-submarines
According this article, the 18 hour schedule was introduced in the 60s. Before that, apparently, a 4 hour on/8 hour off schedule was the norm. "Since the 13th century, maritime workers have utilized a 4 hours on, 8 hours off (4/8) watch schedule that continued into the Polaris submarine patrols of the early 1960s.
https://www.nationaldaystoday.com/national-submarine-day/
A submarine “day” endures 18 hours and is divided into three six-hour shifts. So a submariner may labor for six hours and train, keep up hardware, or rest for 12 hours. They give knowledge, and submerged assurance to surface ships and can identify and lay mines more proficient than other naval force vessels.
https://www.quora.com/Why-do-submarine-crews-count-18-hours-as-a-day
Answer (1 of 3): In the US Navy, when I was in, you had what was called 3 section duty while underway. 6 hours was spent on watch, 12 hours for study/recreation/sleep. This made sure that all watch standers were not regulated to the same hours so that we could take advantage of recreational activ...
https://www.foxnews.com/health/us-navy-approves-changes-for-submariners-sleep-schedules
Military scientists concluded submarine sailors, who traditionally begin a new workday every 18 hours, show less fatigue on a 24-hour schedule, and the Navy has endorsed the findings for any ...
https://www.reddit.com/r/explainlikeimfive/comments/33w2wn/eli5why_do_submarine_crew_only_have_18_hours_a/
Submarine crews are divided into 3 watch sections and rotate on a 6 hour schedule. It's a simple "6 on, 12 off" rotation. So you're actually doing your assigned "job" for 6 hours (assuming no unusual circumstances like "battle stations") and then off for 12. That could mean you go to sleep, study for new qualifications, or even just goof off.
https://science.howstuffworks.com/nuclear-submarine7.htm
A submarine "day" lasts 18 hours and is split into three six-hour shifts. So a submariner may work for six hours and train, maintain equipment or sleep for 12 hours. Bunks are generally stacked three high. Space is at a premium in a …
https://www.navytimes.com/news/your-navy/2016/10/28/this-life-changing-shift-has-made-submariners-much-happier/
The 18-hour day is dead and gone in the submarine force, and junior officers who were on the front lines for the change say the change has been a revolution for morale and alertness throughout the ...
https://www.reddit.com/r/todayilearned/comments/1gxohj/til_that_submarine_crews_do_not_use_a_typical_24/
Yes the shifts are done in 18 hour blocks. 6 hours on watch 6 hours off watch (time to do maintenance, quals, training) 6 hours sleep The boat schedule was still based on 24 hour periods. So all major evolutions (aka drills) were done during the normal "work day" (8 AM-5PM)
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