Guided Hike to the Cosmostation (3,340 m) – Soviet Cosmic-Ray Research Station Above Big Almaty Lake

A guided day hike from Almaty to the Cosmostation — the High Mountain Scientific Station of Cosmic Rays (VNSKL) — perched at the Dzhusaly-Kezen Pass at approximately 3,340 m in the Big Almaty Gorge. The route passes Big Almaty Lake (2,511 m) and the Tien Shan Astronomical Observatory (2,800 m) before climbing to one of the most unusual research facilities in Central Asia: a Soviet-era physics station where scientists have recorded cosmic radiation particles continuously since the mid-20th century.

The Cosmostation is not just a destination — it’s the gateway to the high peaks. From the pass, Tourist Peak (3,954 m) rises to the east and Big Almaty Peak (3,682 m) to the west. Reaching the Cosmostation is itself a challenging day hike; staying overnight in the station’s basic hut transforms it into a launchpad for summit attempts the following morning.

What to expect

The hike begins where vehicle access ends in the Big Almaty Gorge — at the last checkpoint, approximately 1,700 m above sea level. From here, the route follows the road uphill past the hydroelectric pipeline (the “tube” — a massive steel pipe carrying water from Big Almaty Lake to power stations in the city below). The pipeline is an Almaty landmark: a steep, industrial corridor punched through the mountain forest.

Big Almaty Lake (2,511 m) appears after approximately 5 km of road walking — the turquoise reservoir backed by Satpayev Peak (4,317 m) and the Ozernoe valley peaks. The lake is a protected water supply — approaching the water’s edge is prohibited. Stop for photos from the dam viewpoint.

Above the lake, the road continues climbing to the Tien Shan Astronomical Observatory (TSAO) at approximately 2,800 m — a cluster of white-domed buildings built in 1957. Scientists here study solar activity, atmospheric dynamics, and deep-space objects. The observatory is visible as the road switchbacks above the lake.

The final section from the observatory to the Cosmostation gains another 500+ metres on a deteriorating road/track that crosses the alpine zone — treeline falls away, vegetation thins to grass and rock, and the air becomes noticeably thinner. The Dzhusaly-Kezen Pass opens up as a windswept saddle between the peaks, with the Cosmostation’s low concrete buildings squatting against the weather.

The Cosmostation

The station is formally affiliated with the Institute of Physics and Technology and is one of the oldest high-altitude cosmic-ray research facilities in Central Asia. At 3,340 m, the thinner atmosphere allows more cosmic radiation particles to reach the detectors — the fundamental reason the station exists at this altitude.

The buildings are functional Soviet-era concrete — built for science, not aesthetics. Inside: laboratories, recording equipment, and a basic dormitory hut with bunk beds, a stove, and an outhouse. The hut is available for overnight stays (arranged through your guide) — conditions are spartan but warm enough, and sleeping at 3,340 m provides invaluable acclimatisation before attempting Tourist Peak (3,954 m) or Big Almaty Peak (3,682 m) the following morning.

On the 2-day format, your guide can arrange a brief tour of the station and a meeting with the resident scientists — an experience that no other hike in the catalogue offers. Where else in the world can you sleep in a physics laboratory at 3,340 m and discuss particle detection with researchers over evening tea?

The view from the pass

From the Cosmostation, you stand at the junction of two worlds. To the north: the road descending past the observatory and the lake back toward Almaty, 30 km and 1,600 m below. To the east: the scree slopes rising toward Tourist Peak (3,954 m) — the “hidden” peak behind Big Almaty Peak. To the west: the ridge leading toward Big Almaty Peak (3,682 m) — the pyramid visible from every corner of the city. To the south: the main Zailiyskiy Alatau ridge, glaciated and formidable.

Why book this guided hike?

Altitude. The hike gains 1,655 m in 12 km — that’s steep by any standard — and finishes at 3,340 m. Altitude symptoms are possible, particularly for recently arrived visitors. Your guide manages pace and hydration.

Border zone. The Dzhusaly-Kezen Pass area is within a border zone. Passport or ID checks by border patrol are possible. Your guide ensures documentation is in order.

Road access changes. The Ayusai anti-mudflow dam construction zone periodically restricts vehicle access in the lower gorge. Your guide checks current conditions and adjusts the logistics.

The Cosmostation hut. Overnight access must be arranged in advance. Your guide handles coordination with the station staff.