Where such checks as well as approximately 40 kilometers in tunnels to check water leakage in tunnel, all of all channels, including the tunnel area of the CS and CN.
The audit The total distance of 40 kilometers in the tunnel. It is necessary to monitor water leaks in the tunnel. All stations are mandatory The tunnel area with CS and CN.
Which such inspections, a total distance of about 40 kilometers in the tunnel. To verify the leak in the tunnel to complete all the stations, as well as the tunnel area and with CS CN .