This is another great example to think deeper to balance cyber and physical world rather than just blindly putting unnecessary investment in cyber protection.
There are researchers able to demonstrate remote control of the crane via a Casio watch. Is this scary? Without knowing the exploitation condition, management will be misinformed. We, as security practitioners, must analyze the situation, identify how this can be exploited before provide the correct message.
The physical conditions of the crane must also be well under attention. Imagine a loosen bolt / nut, or erected at the improper foundation, incorrect procedure to extend the crane height could all result into the same catastrophic consequence.