X-WATERS Калининград

Beneath the calm water of Sinyavinskoye Lake lie the submerged rails and flooded forests of a historic amber quarry, filled with clear spring water. The X-WATERS Калининград event takes open water swimmers into this deep freshwater lake, situated between the settlements of Yantarny and Sinyavino in Russia's Kaliningrad region. Staged during the warm days of July as part of the X-WATERS World Championship, the competition is organized by X-WATERS. Standing on the water's edge, swimmers gaze out across a serene basin.

Sinyavinskoye Lake: the counter-clockwise quarry course

All race distances share a single, well-organized start and finish area along the lake shore. Competitors choose from courses measuring 500 meters, 1 kilometer, 3 kilometers, and 5 kilometers, making the event accessible to both aspiring open water racers and seasoned marathoners. With gear secured and bright buoys trailing behind, swimmers assemble near the starting line before plunging into the fresh water. Once the horn sounds, swimmers navigate around the course in a counter-clockwise loop, keeping the bright marker buoys strictly on their left side throughout each lap. The line of sight is clear across the lake, allowing competitors to lock into a steady stroke rhythm without the navigation challenges of changing tides.

Although the enclosed quarry offers far more shelter than the open Baltic surf, strong winds can still sweep across the expansive surface. In past editions moved into the quarry when the sea proved too rough, swimmers faced noticeable chop and headwind over the first kilometer. In a past edition, swimmers took part in a night swim across the lake, using individual lights that created a glowing effect over the dark water. Moving through the pitch-black basin guided only by their luminous safety floats, participants experienced an unforgettable atmosphere as dozens of glowing beams drifted across the silent expanse.

The flooded pit: spring water, thermoclines, and sunken forests

The lake itself was once an open industrial pit that plunged to depths of up to 30 meters before excavation ceased and natural underground springs gradually filled the vast hollow. This remarkable depth creates a distinct layered thermal structure characterized by two distinct thermoclines where warm surface layers and frigid bottom waters do not mix. While the deep subterranean abyss remains cold, the surface warms comfortably during July and August, becoming especially mild in the shallows along the shore, though localized shifts can occur across the basin. Swimmers skimming the top layer feel the pleasant summer heat while looking down into the deep, mysterious waters below. Below the swimmer's body lies a surreal and preserved world dating back to the quarry's active working era.

Looking through the clear freshwater, one can discern the branches of a drowned forest, submerged sections of a narrow-gauge railway, and industrial construction structures left behind when the pit was inundated. Because of these unique underwater relics, Sinyavinskoye Lake has become popular with divers. Other freshwater bodies in the surrounding region share a similar connection to human engineering and local hydrography. In 1910, engineers built a municipal pumping station on the shore of Lake Tikhoye to supply tap water to the coastal community of Rauschen, today Svetlogorsk. Today, Lake Tikhoye is celebrated for its soft, slightly alkaline water with a balanced pH between 6.97 and 7.10.

From blue earth to the Walter mine: the story of Palmnicken amber

Human settlement in the area began around amber extraction when Palmnicken was founded in 1654, with early residents dividing their time between manual amber gathering, agriculture, and coastal fishing. About two kilometers from the race area, the local ground holds roughly 90% of the world's amber reserves, dating back approximately 50 million years. In the late nineteenth century, extraction evolved as operators deployed steam and manual dredgers to dig into the seabed of the Curonian Lagoon. Soon after, deep underground operations commenced with the opening of the Henrietta mine in 1873, followed by the Anna mine in 1883. As industrial demands expanded, mining shifted toward open excavations, leading to the creation of the Walter open-pit mine in 1912.

Located 1.5 kilometers from the sea, this colossal quarry reached depths of up to 50 meters, excavating vast amounts of soil to harvest the fossilized resin. At the end of World War II the amber quarry at Palmnicken was flooded and its machinery demolished. Maritime wartime history played out in nearby waters as well, where the German submarine U-2 operated at depths between 80 and 150 meters. On April 8, 1944, about nine kilometers away west of Pillau, the submarine collided with the steam trawler Helmi Söhle and sank, though its wreck was raised the following day.

Yantarny beach: Blue Flag sands on the open Baltic shore

The coastal settlement of Yantarny holds approximately 90% of the world's explored amber reserves, making it the undisputed global capital of the fossilized gem. Along its maritime edge stretches the widest sandy beach in the entire Kaliningrad region. To preserve this natural recreational treasure against coastal erosion, the shoreline is continuously nourished by pulp discharged from the amber processing combine. Thanks to rigorous environmental care and water cleanliness, the beach at Yantarny earned the distinction of becoming the first in Russia to receive international Blue Flag status. Drifting alongside the deep industrial history of Sinyavinskoye Lake, competitors encounter an open water venue unlike any other.