The leaders of Germany, France and Spain have landed near the crash site of the Germanwings passenger jet, which came down in the Alps. The sound recorder recovered from the scene is badly damaged, but it's hoped it can still help determine what caused the tragedy. The area is difficult to access, and it's more or less impossible for helicopters to land there. Here is what we know about the lead up to the tragedy.<br /><br />FOLLOW LIVE UPDATES: http://on.rt.com/besjt3<br /><br />RT LIVE http://rt.com/on-air<br /><br />Subscribe to RT! http://www.youtube.com/subscription_center?add_user=RussiaToday<br /><br />Like us on Facebook http://www.facebook.com/RTnews<br />Follow us on Twitter http://twitter.com/RT_com<br />Follow us on Instagram http://instagram.com/rt<br />Follow us on Google+ http://plus.google.com/+RT<br />Listen to us on Soundcloud: https://soundcloud.com/rttv<br /><br />RT (Russia Today) is a global news network broadcasting from Moscow and Washington studios. RT is the first news channel to break the 1 billion YouTube views benchmark.