HANGZHOU, Nov. 15 (Xinhua) -- At least 50 people are trapped underground after a road caved in on a subway tunnel under construction in the eastern Chinese city of Hangzhou on Saturday, rescuers said.

    The exact number of people trapped is still unknown, but they are believed to be mostly construction workers.

    Thirteen vehicles were trapped in a 75-meter-long, 50-meter-wide and 15-meter-deep crater after a section of road collapsed into the tunnel in Hangzhou, capital of Zhejiang Province, at about 3:15 p.m..

    Some 2,000 rescuers are struggling to pump water our of the tunnel.