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You usually don't unless you're doing an operation that keeps you submerged for a couple of months, but if you're a hermit in port and stay indoors, it doesn't help either.
The problem stems from a lack of sunlight and fewer sources of Vitamin D while on extended operation periods of 2 or more months submerged. UV light from the sun reacts with the skin to produce Vitamin D, and a lack of it causes sensitivity.
The problem is not as prevalent as it used to be in the old submarine days of WWI and WWII; Vitamin D sources are a medical requirement aboard all Navy vessels. For submarines, the ice cream machine is typically the best source (the mix is fortified with D), since milk and fresh vegetables typically run out within 2 weeks, and preserved eggs about 6 weeks. Most crew don't like drinking the powdered milk mix (one, it tastes bad, and two, it doesn't have caffeine for long stretches where you need to be alert), and canned veggies don't offer as much nutritional value as fresh ones do.
What else can I help you with?
How do sailors say yes?
Most sailors say 'aye' for 'yes'
When did Liverpool Sailors' Home end?
Liverpool Sailors' Home ended in 1969.
What is a collection of sailors called?
A collection of sailors is called a crew of sailors.
The ratio of sailors to pirates was 7 to 2. If there were 44 pirates how many sailors were there?
154 sailors. 7:2=x:44 44/2=22 7x22=154
When was BAE Systems Submarine Solutions created?
BAE Systems Submarine Solutions was created in 2003-03.
What happens when a submarine implodes?
All the sailors in it die.
Do sailors hot bunk on a Collins class submarine?
yes
Who authorised ashes of japanese submarine sailors in the 1942 attack in sydney harbour?
The Australian war cabinet.
Which invention help sailors steer without seeing the sun or the star?
a compass
What two mirrors device use by sailors in a submarine?
The periscope, and I believe they have a lot more than 2 mirrors.
Who is supposed to be Sailor Sun on Sailor Moon?
No one. There are only sailors for planets, and the sun is a star.
How do you not have a sun burn but a sun tan?
Some people have a higher rate of sensitivity in their skin cells
What do you do after you have beaten Pokemon diamond elite four besides heal the sailors sun?
........
What invention helped sailors steer without seeing the sun or stars?
The invention that helped sailors steer without seeing the sun or stars is the compass. Compasses use the Earth's magnetic field to show sailors which direction they are heading, helping them navigate even when visibility is poor.
How long can a submarine go?
A submarine, theoretically, can go as long as the food for its sailors last. A submarine can make oxygen, distill water, remove CO2 and other pollutants, and provide almost anything needed to survive at sea and underwater for nearly an indefinite period of time. Modern nuclear-powered submarines' reactors will last without refueling for the life of the submarine - about 20 years. In 1960, the nuclear-powered submarine USS Triton circumnavigated the globe submerged.
What instrument made it possible for sailors to calcute their position by the sun and stars?
The sextant and the clock.
What instrument could sailors use to determine their location based on the position of the sun in relation to the horizon?
Sailors could use a sextant to measure the angle between the sun and the horizon. By comparing this angle with known tables, they can determine their latitude at sea.
