In the middle of the center of Prague, at a depth of over 50 meters, the tunnel facilities for a new subway station are currently being built. The VALLA 250E mobile crane is being used for various lifting tasks in the tunnel. An indispensable machine for the current construction work. But now the construction site is at a complete standstill, as the mobile crane needs professional maintenance and repair - as quickly as possible. Find out now what happens next.