This video shows some tricks and glitches you can do on Avalanche.
Here’s a video to show you how to get under Construct, and you can do it while in Matchmaking.
Instructions from the Youtube page: Jump from the center line of the floor and tap crouch until you are about to land in the lift, and then proceed to hold crouch. When you have successfully landed at the bottom of the purple lift, DO NOT LET GO OF CROUCH. Position yourself directly over the hole beneath you and then begin crouching repeatedly(fairly fast, because if in an uncrouched position for too long, you will float up the lift) untill you have fallen through.