American warships are capable, lethal, and imposing, so much so that it can be easy to forget that they are still just lumps of metal floating through highly damaging saltwater while running at high power as hundreds or thousands of sailors prowl their decks.
Here's how sailors make sure that all the sailing, work, and seawater doesn't doom the ship before it can shoot its way through enemy fleets:
One of the most important parts, besides avoiding enemy missiles and shells, obviously, is making sure that the saltwater stays in the ocean and doesn't get inside the ship. That's why the Navy has hull maintenance technicians like Ryann Galbraith, above. They work on all the plumbing, decks, structures, and hulls, patching, welding, riveting, etc. to keep fluids and steam in dedicated pipes.
Of course, the hull itself can be vulnerable, accumulating barnacles and other sea life and rusting from the exposure to water and salt. To deal with this, the Navy sends sailors around the ship, often in small boats, to touch up paint or clean off risky accumulations. Also, they send divers under the water to clean the hull and perform more maintenance.
But the ship also needs to be able to hit back if it comes under attack, and weapons like the Phalanx close-in weapons system allow it to knock the enemy's missiles and other airborne threats out of the sky. But, you guessed it, all those moving parts and sensitive electronics need a lot of maintenance as well.
Wires fray, parts wear out, electronics degrade. Fire control sailors make sure their weapons will protect the ship when called upon.
The maintenance can get a lot more complicated when you go inside the ship. The engines on Navy ships, whether fueled by diesel, gasoline, or nuclear, are pretty complicated. They need to be regularly inspected, pumps and belts have to get replaced, oil and other fluids need to be changed.
And that's all if everything goes according to plan. When engines experience a real breakdown, it can necessitate people crawling through the engine or the ship getting towed into port for drydock maintenance. So, doing the maintenance is worth the effort.
But Navy engines actually have a lot of maintenance needs with few civilian equivalents. The sailor above is changing out the burner barrel on an amphibious assault ship. Do any of your vehicles have burner barrels? Mine don't. And few people need specially trained staff to keep their nuclear reactors from poisoning the passengers.
By the way, there are so, so many pictures online of sailors welding. That's not surprising since ships are made of metal and that metal needs to be repaired. But still, so many pictures. This particular one shows a hull maintenance technician repairing a crane cradle on a submarine tender.