About This Route
Imja Tsho (Imja Lake) at 5,010 meters below Island Peak in the Chhukung Valley offers perilous high-altitude scuba amid Everest Base Camp side treks. This proglacial lake, expanding rapidly from meltwater, is accessed via Dingboche and Chhukung (3,800m), a 2-day hike from EBC. Depths to 30m reveal unstable sediments; stunning views of Lhotse and Nuptse. Proglacial instability heightens risks; follow ICIMOD monitoring for lake outburst floods (GLOF). Extreme divers only, with TDI Advanced Nitrox cert.
Safety Considerations
Proglacial hazards dominate: unstable ice dams risk sudden drainage; dive with GLOF sirens monitored via apps. Altitude halves tissue loading times; employ trimix for depths over 15m per DAN AAUS tables. Core temp drops fast in 0-3°C water; passive rewarming post-dive. Silt plumes reduce viz to zero; redundant SMBs mandatory. Buddy contact constant due to whiteout potential from Dig Tsho-like events. Acclimatize 48 hours at Chhukung; pulse oximeter checks q4h.
Essential Gear
Trimix analyzer, Fourth Element drysuit, cookie cutter beacons, ice screws for belay. NPS-approved crampons for approach.