For the first time since WWII US sub sinks enemy warship with a torpedo.

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A multi-million-dollar U.S. Navy torpedo detonated underneath an Iranian warship in a nighttime submarine strike off Sri Lanka’s southern coast — an attack, War Secretary Pete Hegseth said Wednesday in a Pentagon update, was the first of its kind since World War II.

The weapon, identified as a Mark 48 Advanced Capability (ADCAP) torpedo, underscored the scale of force used, and signaled to Tehran that "the gloves really are off," according to a former U.S. submarine commander.

"The Mark 48 is one of the most lethal anti-ship weapons in the U.S. inventory," Thomas Shugart, an adjunct senior fellow at the Center for a New American Security, told Fox News Digital.

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