third of them would have specific responsibilities in the event of an emergency including searching cavan's 4 occupants. would be approximately 200 of those staff responsible for being stairway guides and mr. personnel. in answer to your question this requires constant familiarization and indeed so constant investment. that speaks to the safety culture question that has come up many times, one of the leading indicators for us with crew is that they have to see us walk the walk and talk the talk and constant investment in particularly technology and electronic mustering is a significant example of that. >> hernan zini, you mention technology you are using in this process, to keep forward of who is on or off and so forth. many of these events are a stack up of remote events so how do you assure power? all of these devices required electrical power. and what is the reliability of the best power source. >> they're constantly charged. and a particular incident will be considered, lasting eight to ten hours and many of those victims are supplied by emergency power. and the physical pd a to the br

because cavan's answer 21 million was arbitrary. ..of fixed and maybe it's not completely arbitrary but there is a lot to it, and that bothers a lot of people. but, dollars are arbitrary. a lot of financial instruments have arbitrariness built around them. the true financial professionals will tell you even gold is arbitrary. and over time we introduce a new financial instruments of any kind whether it is a currency or a commodity there is often a lot of confusion abu

because cavan's answer 21 million was arbitrary. ..of fixed and maybe it's not completely arbitrary but there is a lot to it, and that bothers a lot of people. but, dollars are arbitrary. a lot of financial instruments have arbitrariness built around them. the true financial professionals will tell you even gold is arbitrary. and over time we introduce a new financial instruments of any kind whether it is a currency or a commodity there is often a lot of confusion about it, confusion by government, confusion among the public and even confusion among the professionals. this is no different than when we were introducing paper money when the united states was going to paper money folks could be rolling out all sorts of different dollars. the greenback was the federal government trying to come in and that's why we have the secret service. they rolled it back in the 1860s and the secret service was there to nick sure this was the one currency that we had about the different banks could be printing their own u.s. dollars. and we had lots of other confusions when we rolled out the instruments.