Preselect Grapple and be ready to use it when entering the room. Release up or angle up before releasing grapple so the shinespark does not activate instantly. Fall into the sand below the Grapple block with Gravity disabled. Sink into the sand slightly before shinesparking diagonally. Use the windup frames for a shinespark to extend the duration timer.

Entrance condition:

{
  "comeInShinecharged": {
    "framesRequired": 110
  }
}

Requires:

{
  "notable": "Shinespark"
}
"h_canNavigateUnderwater"
"canShinechargeMovementTricky"
"canPlayInSand"
"Grapple"
{
  "shinespark": {
    "frames": 63
  }
}