This dive site, Hilloisten Louhos, is an old granite quarry situated in Finland. Access to this unique site is restricted, requiring prior authorization from a local dive club or the operating company, with specific diving hours allowed only on weekdays after 3pm and during weekends. It serves as an excellent training ground suitable for divers of all experience levels, featuring depths that accommodate various skill development needs. The underwater landscape is characterized by the quarry's rock structures, and a notable feature is a sunken "submarine" which adds an element of exploration and navigation to the dives.
Marine life at Hilloisten Louhos is modest, primarily consisting of a few perch often observed near the starting point and around the "submarine." While underwater biodiversity may not be its main draw, the site provides a serene environment. Above the water, it's common to spot eagles soaring in the sky, adding a touch of natural beauty to the quarry setting.
The best time to visit Hilloisten Louhos is during the approved dive times, particularly in the warmer months when conditions are generally more comfortable for freshwater diving in Finland. It is an ideal spot for divers looking to practice skills, conduct training, or simply enjoy a quiet dive in a controlled environment. Freedivers will also find the maximum depth of 14 meters suitable for breath-hold diving practice. Prospective visitors must ensure they arrange access through the appropriate channels well in advance of their planned dive.

