Their mission will be to counter the Iranian mini-submarines, which are “a huge problem for us,” says retired Navy Cmdr. Christopher Harmer, who from 2008 to 2009 was the director of future operations for the US Navy Fifth Fleet, stationed in Bahrain.
“They are a threat to us because they can disperse them throughout the Persian Gulf and the Arabian Sea, and it’s extremely difficult for us to track them,” he adds. As a result, they can lay "in wait to execute an ambush.”
The US Navy is more accustomed to tracking large, Soviet-era nuclear-class submarines – something Iran knows well, adds Commander Harmer. “Looking for small subs in shallow water is much more difficult, because the acoustics are so much more difficult – smaller makes less noise.”
As a result, he adds, the Iranian military-industrial complex “has prioritized these mini-subs – and have gone into overdrive building them.” Mini-submarines are generally considered any submarine vessel under 500 tons and roughly 100 feet long or less.
Five years ago, the Iranian military had “no mini-subs,” says Harmer, senior naval analyst at the Institute for the Study of War in Washington. Now they have 19 in service, and are building an average of four per year – a “strategically significant” force, he adds.