Me and my brother discovered a 2man glitch that can completely skip entire levels.
To do it the host must hold a second player with both hands and the second player must then mash the reload button, this sends the host flying at great speed towards player 2 if performed more and more time before the host lets go, at which point the host will be shot flying with midair control.
We managed to complete Aztec in almost under a minute on Xbox 1.
We call it the "Giga Jump" for obvisous reasons.
I found this glitch out while screwing around with the moonpool and it is truly something to behold.
If you build a moonpool and have it fully flooded on the inside and exit with the seaglide in hand by swiming out, it multiplies its speed by about x3 and i have consistantly done it in multiple places and times.
Just flood a moonpool and swim out of it with a seaglide in hand. The glitch will stay in effect until you re-enter the moonpool and exit without the seaglide in hand or until you un-flood the moonpool. you can also swap batteries without the glitch ending too.