In the beginning get a piston and a TNT.

Then go to a sandy place and dig a hole down to put the piston in that hole.

Then in front of the piston dig two holes down so you can stand in the hole.

Then you need to put TNT in front of the piston.

Make a switch to make the piston move forward.

Then you will glitch when you pull the lever and you are in the hole, and you will see all tunnels!