Clipping through floor/wall with cart on blue lane

[Spoopetor]

Match ID: 72941519
6 minutes

If you dash slide into the middle of the sloped cart on blue lane and release slide right after going under the front of it you can get popped under the map or into the wall to the left.
You can unstick into the tunnels but get stuck inside them and have to command kill to get out.
It works fairly consistently on at least Mina, Abrams, and Viscous, probably most except Rem.
Incredibly ethical patch to allow everyone to access Rem tunnels

 

[Spoopetor]

You can also do it on side lanes but because of no tunnels beneath will just fall into the void and be popped up unless you have a movement ability to get to ground.