This is a glitch found by Chinese player Thesecondman/Erlao. It can be performed after obtaining Air Float. At any right angle space, Hold up and press jump and air float button simultaneously then check if Efrain's leg sink to underground. If yes, hold the opposite direction of character's face to sink into walls. (Hold left = you'll move to right direction) In the wall, activate any Turbo shot/Auto-fire software or Turbo switch on your game controller to reduce the speed you're left from the underground/soil (Or sink into soil). If you want to keep 0 degree balance (move straight left/right in the wall), The speed of Turbo shot/Auto-fire must be higher than 60 hits per second. (NOTE: Any route generated by auto-fire is not allowed in the categories; didn't want to interrupt with general speedrun.com rules.) Unlike OoB glitch in LC1, here it is a really useful trick that can produce so many crazy warp glitch due to the characteristic of room transition/loading logic of the game. It also has a variation in many horizontal room transition places but the Turbo shot/Auto-fire speed also must be higher than 60 hits per second.

After going OoB there's a chance that you would die OoB INSTANTLY. It's NOT random -- It's activated when you try to "jump-air dash" in OoB state (You run so far away from the normally available move space in the screen). It's not 100% following logic if an underground/soil is solid or not; Instead it relies on test with LARGE amount of samples. Same as the warp transition situation of every location.