Mario Torres Lopez, 42, was working at a depth of about 100m (328ft) when the mine collapsed.

BBC: Chile slow search for miner trapped 100m underground

Shell says it's working at far less depth and lower pressures than the BP well that erupted off Louisiana, destroying the Deepwater Horizon drill rig and killing 11 men aboard.

CNN: Ice floe halts Shell's new Arctic well

Shell says it's working at far less depth and lower pressures than the BP well that erupted off Louisiana, killing 11 men aboard and unleashing an undersea gusher that took three months to cap.

CNN: Alaska drilling rig towed to harbor off Kodiak Island

Shell says it's working at far less depth and lower pressures than the BP well that erupted nearly a mile beneath the Gulf, killing 11 men on board a rig and unleashing an undersea gusher that took three months to cap.

CNN: Shell halts Arctic drill plans for 2013