Stand on the edge of the sand and place a Bomb and wait briefly before entering the sand. Let the Bomb explosion push Samus up for a few frames before simultaneously jumping and aiming down. There is about a 2 frame window before too much height is lost to reach the nearby ledge. Jumping too early can lead to a softlock but jumping too late usually exits the sand safely.

Requires:

"canSuitlessMaridia"
"canDownGrab"
"canSandBombBoost"
"canInsaneJump"