Rescuers got another handwritten note from trapped miners on Tuesday through a drilled hole 21.9 centimeters in diameter, according to Xinhua News Agency.

"Please send down another telephone to us for backup. Once we lost communication with you, we are not able to find the Party," it reads.

Based on the communication with the trapped workers, rescuers are drilling two additional holes for draining away underground water to keep the workers safe.

Twenty-two workers were trapped underground after an explosion took place on Jan 10 at a gold mine under construction at Qixia, Yantai city in Shandong province.

Rescuers have located 12 trapped workers through a drilled channel.

Video by Zhao Ruixue and Zong Laisong.