NEW DELHI (NYTIMES) - The images shocked and angered the world: Hundreds of climbers trapped near Mount Everest's summit, hooked to a single safety line on a ridge with a several-thousand-metre drop, their oxygen cylinders emptying until a few people died from exposure.

The traffic jam during last spring's climbing season, one of the deadliest on the planet's highest mountain, underlined what veteran alpinists have been saying for years: Ego, inexperienced climbers, big payouts and chronic mismanagement - including the dangerous practice of cutting corners on vital safety equipment - have turned Everest into a circus at 8,848m.

After the season ended, Nepal's government announced robust safety rules intended to weed out inexperienced climbers, reduce the number of people on Everest and prevent another pile-up, which was blamed for some of the 11 deaths in 2019.

But now, the government says the new rules will not be imposed for the coming climbing season, which begins in April and lasts through May. Despite international scrutiny and intense pressure from climbing groups to tighten operations on Everest, officials say the rules need further review before they can be put in place.

Mr Kedar Bahadur Adhikari, the secretary of Nepal's Tourism Ministry, said the rules, which were introduced last August, had yet to receive approvals from several government offices, including the defence, law, finance and forest ministries.

He said officials also needed to see whether Nepali expedition operators "were okay with some of the restrictions", though mountaineers say the companies' involvement in negotiations should be limited because of their financial stakes.

Mr Santa Bir Lama, the president of the Nepal Mountaineering Association, an independent climbing group that manages Everest and helped draft the new safety regulations, said Nepal's financial desperation was one major reason behind the delay.

He said that officials could approve the new measures in a couple of weeks if they wanted, but that government climbing permits - which cost US$11,000 (S$15,240) per person for Everest - provide crucial cash flow for Nepal, one of Asia's poorest countries.

"If something goes wrong, the tourism minister should be personally responsible," Mr Lama said. "Nobody wants to come to Nepal to die."

On the northern side of the mountain, which falls in China, stricter safety regulations are in place. But there are few limits on who can get a permit to climb Everest from Nepal, where most ascents occur.

Some operators in Nepal have been accused of taking practically anybody up the mountain, regardless of skill. Expedition teams are free to set their own dates for a climb. Many choose a narrow window each May to avoid the mountain's otherwise extreme weather and high winds, contributing to the crowding.

But restricting the number of climbing permits, Mr Adhikari said, is among the measures that are off the table for now. Last year, officials granted a record 381 permits, a figure that did not include hundreds of Nepali support staff.

That number has gone up steadily nearly every year since the 2000s, leaving Everest clogged and unruly, many mountaineers say. Officials said they expected to issue more than 400 permits this season. "Let's hope there's no traffic jam this year," Mr Adhikari said.

Officials did not give a timeline to adopt the other proposed rules either, including a requirement that clients of Everest climbing companies prove that they have high-altitude experience, or that they have paid at least US$35,000 for their expedition. That amount ensures, to some degree, that climbers have enough oxygen cylinders and mountain guides for the journey, though some veteran mountaineers said the regulation was still imperfect.

Climbers said law and order had gradually eroded on the mountain.

"The screw needs to be tightened," said Mr Kami Rita Sherpa, a Nepali climber who has reached Everest's summit 24 times, a world record. "Inexperienced climbers should be barred from the mountain."

Amid the heightened focus on safety, some climbing companies said they would take stricter measures regardless of whether the government mandates them.

Mr Mingma Sherpa, the chairman of Seven Summit Treks, said his company would require climbers to prove that they had scaled at least one other peak higher than 6,000m before attempting Everest.

But Mr Lal Bahadur Jirel, a Nepali climbing guide, said incremental steps were not enough to fix an increasingly perilous situation on Everest, where summertime temperatures routinely dip below -15 deg C.

Last May, Mr Jirel and his 11-person team were caught in the traffic jam on Everest. On a clear morning, hordes of climbers took advantage of the good weather to make a push for the top.

The situation quickly became a free-for-all.

Climbers pushed and shoved one another to take selfies on the summit, which is about the size of two ping-pong tables and where oxygen levels are only a third of those at sea level. With so many climbers clipped to a single safety line, some were unable to descend in time before they ran out of oxygen. They collapsed on the ridge.