T u n n e l i n g w o r k o f
a n o r t h - s o u t h l i n e


1. Inside of North-south Line Tunnel

2. Compost Toilet Appearance

3. Compost Toilet
  • This is the compost toilet used at the time of the tunneling work of a north-south line.
    It is playing a role in the improvement of work environment.