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Carriers – and ships in general – need a lot of fuel for their missions. To supply their boats, the Navy fields a specific vessel to be used as a tanker.
Constructing a floating fuel depot in the middle of the ocean is entirely plausible. However, these depots can be pretty dangerous. For one thing, they are easy targets for enemies.
The refueling process needs a tanker ship to pull up alongside the vessel being refueled. Several pulleys and cables are used to transfer the fuel hose from the tanker to the boat.
Though it may seem easy, an accidental detachment or rupture can result in thousands of gallons of fuel spilling into the ocean.
It’s not strictly for fuel, either. In some cases, food, weaponry, and even personnel can be delivered from these ships.