(Alberto Ferrante, Creative Commons)
The men were trapped under 100 tons of collapsed coal and rock.
Second explosion in five days ended hopes of survival, rescue.
Situation different from Chile, officials say.
A rescue worker steps out of a capsule similiar to the one that will be used in the rescue. (HUGO INFANTE/GOVERNMENT OF CHILE)
The rescues will begin shortly of 33 Chilean miners who have been stuck in a collapsed mine for 68 days.