How could USS Iowa fire a 2,700-pound armor-piercing shell roughly every 30 seconds?

The answer was not simply the power of her famous 16-inch/50 Mark 7 guns. Hidden beneath each turret was a multi-level ammunition-handling machine operated by dozens of sailors—projectile rings, parbuckling gear, hydraulic hoists, powder rooms, rammers, breeches, interlocks, and fire-control systems all had to work together.

In this documentary, we go inside the engineering of an Iowa-class battleship turret to follow a 16-inch projectile from storage to the gun.

We examine how a 2,700-pound Mark 8 armor-piercing projectile was moved across the projectile flats, lifted through the turret, aligned with the breech, rammed into the gun, and paired with roughly 660 pounds of separately handled propellant.

We also look at the human side of the system. Nearly 100 sailors could be involved in operating and supplying a single three-gun turret, including powder crews handling bags weighing more than 100 pounds each.

Then the engineering meets combat.

On February 17, 1944, during the surface action off Truk, USS Iowa fired eight main-battery salvos totaling 46 sixteen-inch High Capacity shells at the damaged Japanese cruiser Katori. The engagement demonstrated the enormous throughput of Iowa’s main battery—but also exposed the limits of such a complex machine, including a failed firing lock and radar equipment disrupted by the shock of Iowa’s own guns.

This is not simply the story of a powerful battleship gun.

It is the story of the hidden machine required to make that gun ready again.

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