Chinese soldiers were still scaling mountains and hacking their way through brambles and thorns in a desperate attempt to search for a downed military transport helicopter on Tuesday.

President Hu Jintao, also General Secretary of the Communist Party of China Central Committee and Chairman of the Central Military Commission, instructed the rescuing team to continue sparing no efforts to search for the helicopter after debriefing a searching report on late Monday.

As of 10 PM Tuesday, the helicopter was still missing and no one onboard has been found.

Guo Boxiong, vice chairman of the Central Military Commission, also urged the troops to do their best in the search at an emergency meeting.

In Yunhua mountain, more than 10 kilometers from Dujiangyan, dozens of soldiers were ascending the mountain to search the Mi-171 chopper from the People's Liberation Army that disappeared on May 31.

Troops from the Jinan Military Area Command were combing the area in southwest China's quake zone.

But steep mountains, dense bush and slippery tracks made the search difficult, said Liu Xitang, a battalion commander from Jinan Military Area Command.

He said the army started a "blanket search" in the area at 4 AM on Tuesday and nothing had been found so far.

Soldiers, who arrived in the area on Monday, have had to haul each other over the rugged terrain in case they fell on the slippery ground, said Fu Junhui, an army company commander.

Large landslides also hampered the search, he said.

By 9 p.m. on Tuesday, nothing had been found and the search was to resume at daybreak on Wednesday.

As of Monday night, 10,822 troops and paramilitary personnel had joined the search, which covered Yingxiu Township and Heishui Township of Aba Prefecture, according to the headquarters of the rescue mission..

Around 5 p.m. on Sunday, sunlight was reported glistening of something on Zhaogong Mountain, in Yingxiu Township, near the epicenter of the May 12 earthquake.

Authorities mobilized local residents and troops to search the area in three different directions, but nothing was found.

Villagers have been alerted to report anything out of the ordinary.

At 9:20 p.m. on Sunday, villagers claimed they had heard explosions in Maxi, near Dujiangyan, but another search found nothing.

However, the military rescue headquarters was planning more searches in the region.

"As long as there's hope, we will won't stop searching," said Fu.