The cave is named after the Greek submarine Papanikolis (Y-2), which used the cavern as a base for clandestine operations during the 1940s.
The interior dimensions are large enough to have accommodated the entire submarine, which measured 68 meters in length.
The cave's geological formation is the result of long-term coastal erosion of limestone cliffs typical of the Ionian archipelago.
The depth of the water within the cave allows medium-sized tourist boats to enter and anchor inside the cavern walls.
Papanikolis Cave is a massive sea cave located on the western coast of Meganisi island in the Ionian Sea. Measuring approximately 120 meters in length and 60 meters in width, it ranks among the largest marine caves in Greece. The interior features a sandy beach at the rear and high, stalactite-adorned ceilings. During World War II, the cave served as a strategic hiding spot for the Greek submarine 'Papanikolis', which sheltered here from Italian and German forces. The cave is accessible only by watercraft due to the steep, inaccessible cliffs above. Light filtering through the entrance creates distinct turquoise reflections on the water's surface inside.
From the bow of a boat facing the entrance to capture the contrast between the dark interior and the bright turquoise exterior sea.
Visit via private boat or small-group tour from Nidri or Meganisi to ensure you can enter the cave interior.
Bring a waterproof camera or phone pouch, as the interior is humid and prone to dripping water.
Ensure your boat operator confirms they are small enough to enter the cave entrance, as large vessels must stay outside.
Attempting to swim to the cave from the shore above, as the cliffs are vertical and lack safe descent paths.
Best visited during the summer season (May-September) when sea conditions are calmest.
