Harder Submarine

US Submarine Sinks 4 Japanese Destroyers - The Remarkable USS Harder

The Triumph and Tragedy of USS Harder

USS Harder - SS-257 (Submarine)

Crash Course History

Wreck of WWII submarine USS Harder discovered in South China Sea

USS Harder 'Harder at Woleai'

USS Harder (SS-257): A WWII Submarine's Remarkable Battle Record

An Extremely Risky WWII Submarine Rescue Mission

Smithsonian Channel

USS Harder 'Hit 'Em Again, Harder'

Hell Below - Episode 5: Destroyer Killer | Free Documentary History

Free Documentary - History

Record-Breaking Submarine USS Harder Found!

The Odd Historian

The Navy's Most Advanced Virginia-Class Submarine Is 'Gender-Integrated'

Discovery of WWII U.S. Navy Submarine USS harder, lost in battle, found Intact in South China Sea

Wreckage of USS Harder Found After 80 Years | WWII Submarine Discovery | Latest Updates

USS Harder

Military Channel J

Wreck of World War II U.S. Navy submarine found in South China sea

Submarine sunk during World War II discovered

Veteran ocean explorer discovers WWII submarine in South China Sea

The Most Feared Submarine in the Pacific during WW2

The Submarine that Got Blasted Point Blank by the Ship It Just Sunk

Experts Unraveled the Mystery of a Lost WWII Submarine – and 80 Vanished Crew Members