Spider robots mining Phobos

After a 2 years pause, I am finally coming back to photo montages of Mars !
And here is my first new one.
In his Mars novels, Kim Stanley Robinson tells how asteroids and moons are digged by spider robots, for mining and for setting space stations. Years before, I did a storyboard sketch of this scene, but here it is now in a highly detailed montage. Here, it's not an asteroid. This is Phobos, the largest Martian moon. For the robots, I've used photos of actual spiders.
(Made with The Gimp on Linux-Ubuntu)