Keywords:

sinkhole, close

Description:

minning tunnel for ventilation in underground mine

Request:

Tunnels

• ID: 550886ab6a0caff66822b164
• Original Size: 5184 x 3456px
• Subscription: Available
• License Type: Royalty Free
• Upload Date: March 17, 2015
• Permission: Not Applicable or No.
• Editorial Use: Yes
• Commercial Use: Yes