Dead bodies are a common sight on top of Mount Everest.

“I cannot believe what I saw up there,” Everest filmmaker Elia Saikaly wrote on Instagram in May 2019. “Death. Carnage. Chaos. Lineups. Dead bodies on the route.”

Eleven people died climbing Mount Everest that spring, in what became the peak’s deadliest climbing sprint in recent memory. In 2015, an avalanche roared through Everest, killing at least 19 people. Two died climbing the mountain during the climbing season last spring.

But 2023 has already surpassed that, with 4 deaths at the beginning of the climbing season — and it’s set to be the most crowded year on the mountain yet. Nepal has issued a record 463 permits to people who want to climb Mount Everest. Including sherpas that accompany climbers, that means about 900 people will be trying to summit the mountain during the 2023 climbing season.