Frankenstein is a shore-entry dive site located in Lake Thun, Switzerland. The site features shallow, calm water that is well-suited for divers gaining experience or working on buoyancy control. As a shore dive, it offers straightforward logistics without the need for a boat. Conditions at this location are variable, with visibility and currents shifting frequently. Divers should confirm local conditions immediately prior to arrival and plan to be self-sufficient, as on-site facilities are not guaranteed. The site provides a quiet environment for practice in a freshwater lake setting.

Spiez Wallrain is a freshwater site located directly below Spiez Castle in Lake Thun. This reef and artificial reef site features a pebble-bottomed bay, providing an accessible environment for snorkelers. Entry is facilitated by secured steps leading directly into the water. The site offers depths ranging from 2 to 15 metres, with an average depth of 8 metres. Visibility at this location typically varies between 6 and 10 metres. The site is suitable for beginners and includes toilet facilities for visitors. A typical session lasts approximately 45 minutes.

Spiezerberg is a deep freshwater wall and canyon dive located in Lake Thun. The site features topography ranging from 20 to 40 metres, with an average depth of 30 metres. Access is by boat only, and divers should be prepared for cold water temperatures, which remain constant at 5-6°C below the thermocline. Visibility typically ranges between 5 and 10 metres. Due to the significant depth and potential for entanglement on sharp rocks, this site is suited for intermediate divers. Facilities including air fills, showers, and changing rooms are available nearby. Species recorded around this area include snail, common perch, burbot, barbel, American crayfish, chub, pike, rainbow trout, and bullhead.

Spiezwand in Lake Thun offers a distinct freshwater wall dive featuring submerged trees along the rock face. The site reaches depths between 5 and 30 metres, with an average depth of 15 metres. Divers should anticipate mild currents and visibility ranging from 3 to 10 metres. Water temperatures fluctuate significantly, from 4°C in winter to 19°C in summer. Due to the potential for cold water, entanglement risks, and low visibility, this site is suited for intermediate divers. Shore access is supported by local facilities including parking, showers, changing rooms, a rinse station, air fills, a dive shop, and a cafe.

Restaurant Lido in Lake Thun offers a shore-accessible dive featuring a combination of natural and artificial reef structures. The site reaches depths between 20 and 40 metres, with an average depth of 25 metres. Divers should expect visibility ranging from 5 to 10 metres. Due to the significant depth and cold water temperatures, which vary from 4 to 20 degrees Celsius depending on the season, adequate thermal protection is required. The site presents potential entanglement risks near the artificial structures, and divers must manage their depth carefully. Facilities including parking, toilets, showers, and a cafe are available on site, making it a practical base for a full day of diving.

Bäregg in Lake Thun offers a distinct freshwater diving experience characterised by underwater rock formations and small vertical walls. The site reaches depths between 20 and 30 metres, with an average depth of 25 metres. Divers enter from the shore for a typical 50-minute dive. Visibility at this site ranges from 5 to 10 metres. Species recorded around this area include snails, common perch, burbot, American crayfish, barbel, bullhead, chub, and pike. Due to the presence of boat traffic, cold water, and variable visibility, this site is best suited for intermediate divers. Parking and toilets are available at the location.

Ruedi-Walter-Platz in Lake Thun offers a combination of reef and wall topography suitable for intermediate divers. The site features a wall that descends from 20 to 40 metres, providing a deep-water experience in a freshwater alpine environment. Visibility at the site typically ranges between 5 and 15 metres. Entry is via the shore, and there is no current to manage during the dive. Divers should arrive self-sufficient with a full kit as facilities are not guaranteed on site. Species recorded around this area include snail, common perch, barbel, American crayfish, burbot, pike, chub, and bullhead.

Stampach in Lake Thun is a demanding freshwater dive site featuring a wall and canyon topography. The site reaches depths of 34 metres, with an average depth of 22 metres. Divers enter from the shore, located 50 metres from the main structures. The environment is characterised by strong currents that can funnel unpredictably through the canyon, requiring careful planning and advanced buoyancy control. Visibility typically ranges between 6 and 10 metres. Due to the significant depth, potential for entanglement, and overhead environments, this site is suited for advanced divers. Facilities at the shore entry point include parking and a rinse station.