discussion later. it s the fact that a water-based activated elt did not activate. and it s supposition. david, you have elt right here. let s go to it since les brought it up. this is an elt that would come from a much smaller plane like a sa cessna. elt stands for emergency locating transmitter. this is one of the first ones that came out. this had 121.5 megahertz. these were very unreliable. like just barely over 50% reliable deployment on impact. the new generation that would be in a 777 very reliable. very much so. they ve gone through two iterations since this in an attempt to try to extend the range of that. there s actually two of those elts in a 777. there are. or there may actually be four.
michael, i m sure you are familiar with the malaysian prime minister had to say overnight and now the reference to deliberate activity in the cockpit. does it sound to you, including the times report, that the 777 reached an altitude of 45,000 feet that this was manned or unmanned. it is impossible to tell. i don t think we can take anything off the table. we have to consider the mechanical aspects and sabotage and hijack. it is looking more like the latter two given the evidence. you have four communication methods. emergency locator transmitters in the tail setoff by seawater. you have two distress signals. also victor on 121.5. you have the a-cars. you have four methods and
the ground would be challenging you. absolutely. they would be saying, what is happening, 370? there was a 121.5 emergency frequency anywhere in the world. you speak on that frequency and it overrides any other communications. if pilots were having those problems, could not communicate, they could go to 121.5. that s why it is still such a mystery, carol. martin savidge, mitchell casado, thank you so much for a fascinating glimpse. thank you for joining me today. i m carol costello. at this hour with berman and michaela after a break. captain obvious: i m in a hotel.
be on a frequency. there is a guard frequency which they should have monitored. 121.5. it is simple to broadcast a distress signal. the silence is deafening. that does not mean it is impossible for them to be overcome. i don t think it is that likely. i am more in the camp of a third person in the cockpit or both pilots were in on this. what do you expect on sun rise there? we ll have more information on what those pieces of debris are. we are hopeful. my family goes out to the