Nastel is a freshwater shore-entry site in Lake Thun featuring both reef and wall topography. Divers can explore a vertical wall structure that descends from 8 to 46 metres, with an average depth of 15 metres. Conditions include mild currents and visibility ranging from 5 to 15 metres. Due to the cold water, which fluctuates between 10°C and 18°C, thermal protection such as a drysuit or thick wetsuit is essential. The site is suitable for intermediate divers who should be prepared for variable visibility. Parking is available at the site, facilitating straightforward gear transport for shore entries. Typical dive times are approximately 40 minutes.

Frau Tschanz is a freshwater dive site in Lake Thun, Switzerland, featuring a combination of wall and artificial reef structures. The site profile ranges from 20 to 40 metres, requiring intermediate skills and careful depth management. Divers access the water via a shore entry. Visibility typically ranges between 5 and 10 metres. As the site is located in an active area, boat traffic is a primary hazard; divers should remain vigilant at the surface and deploy a surface marker buoy before ascending. On-site facilities include parking, toilets, and a cafe, providing convenient logistics for before and after your dive.

Fischbalme is a freshwater wall dive in Lake Thun, Switzerland, characterised by a steep drop-off that descends from 20 metres to 140 metres. The site is suitable for intermediate divers who can manage significant depths and the associated risk of nitrogen narcosis. Navigation involves following the wall face, as visibility is generally limited to 5 metres. There is no current, allowing divers to explore the structure at a controlled pace. Shore entry is straightforward, with parking available directly at the site. Given the depth and visibility conditions, guided tours are recommended for those visiting for the first time to ensure safe ascent profiles.

Kanzel is a freshwater reef dive located in Lake Thun, Bernese Oberland. This shore-entry site features a reef structure that descends into deeper water, with the primary diving range situated between 20 and 40 metres. Conditions are generally calm with no significant current, providing a stable environment for buoyancy practice. Visibility is typically around 5 metres, which is characteristic of this alpine lake. Due to these visibility levels, a dive torch is recommended to assist in observing the reef structure and detail during your dive. Divers should remain mindful of their depth and stay within the limits of their personal training while exploring the reef.

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.

Balmholz is a freshwater wall and drop-off site located in Lake Thun. The topography features a steep wall descending to a depth of 30 metres, suitable for intermediate divers. Navigation is straightforward due to the mild current, though divers must remain aware of variable visibility, which typically ranges between 5 and 15 metres. Cold water temperatures persist year-round, making a dry suit or heavy wetsuit essential for this alpine dive. Access to the site is exclusively by boat, which must be arranged prior to arrival. Typical dive times are approximately 40 minutes.

Stampach Ralligen in Lake Thun is an advanced dive site characterised by a steep underwater wall, reef structures, and a canyon. Divers can explore submerged trees located approximately 100 metres from the shore. The site reaches depths of 20 to 30 metres, with an average depth of 25 metres. Conditions include moderate currents and visibility ranging from 6 to 10 metres. A thermocline is present, with temperatures at 20 metres and deeper remaining constant at 5 to 6 degrees Celsius. Due to the depth, cold water, and potential for entanglement, this site is suited for experienced divers. Parking is available for site access.

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.