A Nepal government expedition to clean the Mount Everest has found 11,000 kilograms of garbage and four dead bodies from the world’s highest mountain, officials said Wednesday.

During a two-month long cleanliness drive, a clean-up team of 20 sherpa climbers found garbage like empty oxygen cylinders, tents, plastic bottles, batteries, discarded climbing gear, food waste and faecal matter.

Some of the garbage was handed over to recyclers in a ceremony Wednesday officially concluding the cleaning campaign. Officials called it a successful mission but said more trash still needs to be collected. Some is covered by snow and only is exposed when the temperature rise.

Apart from garbage, four dead bodies were also found on the Everest after they got exposed by melting snow and were carried to base camp and then flown to a hospital in Kathmandu for identification. Two of the bodies were identified as those of a Russian climber and a Nepal mountaineer, but the other two are yet to be identified.

Hundreds of climbers and their guides and porters spend weeks on Everest every spring.