HS Okeanos
The HS Okeanos is a Greek submarine of the Poseidon class built in Kiel, Germany, in the late 1970s and now visible in Palaio Faliro. The vessel was designed for coastal defense and carries powerful torpedo systems suited for protecting shorelines.
Greece was the first country to adopt the Poseidon class and ordered four of these submarines from Kiel. These vessels belonged to the larger 209/1200 series that was later sold to numerous countries worldwide.
The submarine sits in the water near the cruise ship harbor and is easy to spot from the shore. An old turret from the vessel stands as a monument in a nearby park and can be visited freely.
The turret in the park looks like a freestanding small tower and draws visitors who want to learn about Greek naval history. The installation honors the crews who served on Greek submarines over the years.
Location: Palaio Faliro
Address: WMGQ+M6, Palaio Faliro 175 61, Greece
GPS coordinates: 37.92673,23.68801
Latest update: December 5, 2025 18:36
These preserved submarines open their hatches to visitors who want to see where sailors lived and fought beneath the ocean surface. From World War II patrol boats that hunted across the Pacific to the first nuclear-powered vessel that changed naval history forever, each submarine reveals the cramped reality of underwater service. You walk through narrow steel corridors, peer into bunks stacked three high, and stand where officers once studied charts and gave orders in near silence. The collection includes vessels from harbors across the United States and around the world, each one a working museum where the instruments, torpedo tubes, and engine rooms remain as they were during active duty. Some of these submarines sank enemy warships and rescued Allied prisoners during the Second World War. Others served through the Cold War, carrying crews on patrols that lasted weeks without seeing daylight. A few pushed the limits of technology, proving that nuclear reactors could power a vessel across thousands of miles and even under the polar ice. Whether docked in a busy port or resting beside a quiet lake, these submarines bring you face to face with the men who descended into the deep, closed the hatch, and did their work in spaces smaller than a city bus.
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