do. >> why? is that the average? >> that's the average. like the mexico earthquake, we started keeping statistics. that's about how long it takes, four to ten hours. all of these robots are used for telepresence and videoconferencing. we're doing research with stanford university at looking at, well, if i am on the screen going up and down, should my head be going up and down on this or is that just making it more annoying? >> what do we know? >> we don't know yet. but that's why we're researching it. >> so you're going to make this thing as easy to -- as comfortable for the person who is trapped? >> absolutely. because you're already in shock. you're already there. we want it to be calming. like in an mri they give you the music you get to play. also we know that we can give you have certain music and it will calm your heartbeat down. we have a doctor that's done physiological work showing that's a very big thing. the miners themselves, the tasmanian miners went down and requested the foo fighters. >> we'll keep a close eye on