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In 1921, the USS R-14 left Pearl Harbor on a straightforward mission: find a missing tugboat somewhere in the vast Pacific Ocean.
About 100 miles out, the submarine ran out of fuel.
The diesel engines shut down. The batteries began draining. Radio communication went silent. The vessel sat in open ocean with limited food, no mechanical power, and no realistic prospect of anyone knowing exactly where to look for them.
Most crews in that situation would have done one thing: wait and hope.
The crew of the R-14 decided to try something else.
They looked at what they had. Mattress covers. Blankets. Spare canvas from the boat's interior. Poles. The periscope supports mounted on the deck. None of it was designed for what they were about to attempt. None of it needed to be. They were not building something elegant. They were building something that worked.
They fashioned makeshift sails from the fabric, mounted them onto poles and rigged them to the periscope supports, and turned a vessel specifically engineered to operate underwater using mechanical propulsion into something that had not existed before and has not existed since: a sailing submarine.
The wind caught the sails.
The R-14 began to move.
It was not fast. It was not graceful. A submarine is not built with hydrodynamics in mind for surface sailing, and the improvised rigging would not have impressed anyone who knew anything about seamanship. But it moved. Slowly, steadily, in the right direction.
The crew took turns managing the sails and navigating their course back toward Hawaii. They did this for five days. Five days of coaxing a submarine across the Pacific using nothing but wind, ingenuity, and the stubborn refusal to accept that they were stuck.
On the fifth day, the USS R-14 returned to Pearl Harbor under sail power.
The mission to find the missing tugboat had not been completed. But every man on board had come home, and they had done it using mattress covers and determination in roughly equal measure.
The incident was logged, reported, and largely forgotten outside of naval history circles, which is a shame, because it contains something worth remembering. The R-14 was a machine built for a specific purpose, operating in conditions it was never designed for, crewed by people who looked at what they had available and asked not whether it was adequate but whether it was enough.
Mattress covers are not sails. Periscope supports are not masts. A submarine is not a sailboat.
But 100 miles from Hawaii, with the engines dead and the radio silent and the ocean stretching out in every direction, close enough turned out to be exactly enough.
They sailed home.
Five days. One improvised rig. No fuel required.
The USS R-14 remains, by any reasonable measure, the only submarine in the history of naval warfare to return to port under sail. It is unlikely to be surpassed.
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