The US military rarely discloses the locations of its deployed ballistic missile submarines, the naval arm of its nuclear might. When it does, it’s often meant to send a message.
On Monday, the US Navy’s Sixth Fleet shared a photo of an Ohio-class ballistic-missile submarine docked in Gibraltar, writing that the unnamed sub’s visit to the British territory off the coast of Spain “demonstrates US capability, flexibility, and continuing commitment to its NATO allies.”
The Navy release didn’t mention Iran or the ongoing conflict, but the appearance of a “boomer” submarine — that’s designed to carry nuclear Trident II ballistic missiles — in the Mediterranean notably comes at a time of high tension in the nearby Middle East.
The US Navy is blockading Iranian ports, and Iran’s forces have launched attacks on US military and commercial vessels.
And on Monday, President Donald Trump said that the US ceasefire agreement with Iran is “on life support.” He called Tehran’s latest proposal “a piece of garbage,” and, in early April, he vowed that “all Hell will reign down” if they didn’t reopen the Strait of Hormuz, which remains effectively closed. Defense Secretary Pete Hegseth testified in a congressional hearing Tuesday that the US has plans to escalate or de-escalate as needed.
The US Navy has 14 Ohio-class ballistic-missile submarines, each of which can carry 20 Trident II D5 missiles. They are “specifically designed for extended deterrent patrols,” according to the Naval Sea Systems Command. Each Trident missile can carry up to eight nuclear warheads.
These powerful submarines form the undersea leg of the US nuclear triad, which also includes nuclear-capable bombers and siloed intercontinental ballistic missiles.
John Kowalski/US Navy Photo
US Navy ballistic-missile submarines are tasked with staying hidden for months at a time while remaining ready to guarantee, if necessary, a retaliatory nuclear strike. The survivability of these subs isn’t guaranteed by armor or speed but rather by stealth and operational secrecy, which is why locations are usually kept secret.
That’s why their current locations, especially while at sea on deterrence patrol, are among the most closely guarded operational secrets in the US government. A sub’s location in port is far less sensitive than while on patrol.
The movements of attack submarines and cruise-missile subs are not as sensitive, due to the boomer’s key role in nuclear strategy.
In July 2025, USS Newport News made a public stop in Iceland, marking the first time a US Navy nuclear-powered attack submarine visited the country. The visit came amid concerns over Russian military activity in the Arctic.
Adm. Stuart Munsch, the commander of US Naval Forces Europe-Africa, told Business Insider that the submarine’s visit was “important for the strategic signal it sends to adversaries about our presence in the area.”
In June 2024, a US Navy ballistic missile submarine surfaced off Norway amid tensions with Russia. The Navy did not specify the intention.
And in November 2023, during Israel’s war with Hamas and escalating conflicts in the wider Middle East, US Central Command shared a photo of an Ohio-class guided-missile submarine sailing surfaced while en route to the Red Sea. The move was perceived as a signal of support for America’s closest security partner in the Middle East and a show of force aimed at Iran and the Lebanon-based Hezbollah militant group.
A Pentagon spokesperson referred Business Insider to the Navy, which did not immediately respond to requests for comment on the purpose of the display in Gibraltar.
