This tunel was found in the basement after our builders tried to expand it, those who tried to explore it said I didn't seem to have any end  and one person was lost in it. We sent drones into it to find that person but they post connection to the remote after 5 hours.
We heard heavy breathing from microphones on the drone for 10 minutes before they got disconnected too.
Administration of the facility is not allowing any further attempts of exploration inside the tunnel.
Doctor Nikolai Gogolievich recommended putting 6 camera's in front of the entrance to it so we can monitor if  something comes out from it.
If anyone tries to enter the tunnel it will end up with losing job you have been warned.