The Hellenic Navy's Type 209/1100 diesel-electric submarine HS Proteus (S-113) ran aground in Souda Bay, Crete, on 10 July.
The boat, which had been sailing at low speed and on the surface, struck an ancient pier close to shore.
Two Hellenic Navy tugs were at the scene and assisted the submarine back to the naval facilities in Souda Bay. No personnel injuries were reported and no safety issues arose from the grounding, the Hellenic Navy told IHS Jane's , with damage incurred limited to the outer hull.
HS Proteus , the third of Greece's Glavkos-class submarines, has been in service since 1973 and was modernised in 1993-1996 under the Neptune I programme.