for the very first time, being able to operate in a very thin atmosphere, about 1% of what the earth's atmosphere is. but it was relatively limited in terms of the instrument suite that it carries, basically cameras. just pouring down, that's a lava waterfall on that side. the next generation of mars drones will be able to have a range of other capabilities. small drones offer a lot of advantages, they are lightweight, they do very well in relatively high winds, and they can be used and carried to rather extreme environments. 100 metres up... if something catastrophic happens with them, the costs aren't prohibitive. it lets you test things in ways you wouldn't necessarily with a larger system. i think that's just about the fastest spot right there. some people have even taken small drones and flown into the volcano, acquiring phenomenal imagery — destroyed in the process but really beautiful to watch. is it still giving you that warning? no. the other drone we are using has a larger payload, has a number of different cameras and zoom functions, really beautiful, but also a lidar instrument. so lidar uses light to be able to range the distance between the sensor that is emitting a set of photons and a surface.