potentially. what are the obstacles that they face in rescuing these miners? i mean are they 100% sure they've got that shaft capable of bringing up these special capsules or do they have to still test that? >> exactly. now what's going to happen is they're going to lower this camera and they're going to be able to watch and inspect the walls of the rescue shaft. if the shaft is not strong enough, they need to put casing, this steel tube so the capsule can slide, can pull up the miners. right now we can hear some sirens, probably also signaling that they have reached the miners, so there's still some critical moments they need to go through, the shaft for the plan b is not a straight line down, there is some curves and some little turns so they need to secure the walls of the shaft, because everything could happen. that's why families are very