According to Mick Mulroy, an ABC News national security and defense analyst, Iran has provided drone submarines to Yemen's Houthis.

Iran's ties to Yemen Along with ballistic missiles, the Houthis have already begun using aerial and sea drones (also known as boat/surface drones) against foreign ships and vessels in the Red Sea. As reported, there have been direct hits on commercial tankers over the past few days.

Unmanned submarines, however, are reportedly still anothe...