The $4 Million Torpedo That Rules the Ocean — Mark 48

There is a weapon in the US Navy's arsenal that costs $4 million, weighs 3,500 pounds, travels at 55 knots, and can destroy any ship in the world with a single hit. It has been in service since 1972. It has been upgraded continuously for 50 years. And it has never been used in combat against an enemy vessel.

It is the Mark 48 torpedo. And it is the deadliest weapon in the ocean.

Every American nuclear submarine carries between 20 and 30 of them. Every Virginia class attack submarine, every Seawolf, every Los Angeles class boat still in service. Taiwan's Hai Kun fires them. Australia's submarines carry them. The USS Tang was sunk by one of its own predecessors. The Cheonan was broken in half by a weapon based on the same physics.

This is the story of how the Mark 48 became the most lethal torpedo in history — how it works, what happens when it hits, and why no submarine commander in the world wants to hear one in the water behind him.

What you will learn in this video:
- How the Mark 48 hunts and destroys submarines and surface ships
- What the bubble jet effect is and why it broke the Cheonan in half
- How 50+ years of upgrades made the Mark 48 nearly impossible to evade
- Why the CBASS guidance system defeats modern torpedo countermeasures
- What a Mark 48 attack sounds like from inside a submarine
- How the Falklands War showed what heavyweight torpedoes do to warships
- Why Taiwan, Australia, and every US ally uses the Mark 48
- What the Mark 48 Mod 7 can do that earlier versions could not

Naval Depth is your destination for in-depth analysis of naval warfare, submarine technology, and maritime strategy. New videos regularly.

This video is an independent educational analysis. The capabilities and technical details discussed are based on publicly available sources including USNI News, Naval Technology, US Navy fact files, and published naval references. All content is for informational and educational purposes only.

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