I tried very hard and yet this one still got voted In all honesty, it was a double meaning, mobster tunnel thingy and then mobster as in mafia as in tunneling
Aki had a good idea of what it was even before, but after the Gotthard word, it became easy. It sounds like a very difficult word but Aki just typed it in the google search box and all drop down options had tunnel in them~!
Sorry was gone for a bit. Congrats to @Aki Aki for securing the oath word and bridging down the council.