Roll all the way right before using Xray to stand up, aligned with the right side tiles. Partially clip into the floor to enable the next jump. Use an R-Jump to morph into the tunnel. The second morph ball sized hole can be passed by simply jumping out of the floor clip position with diagonal held.

Requires:

"h_canNavigateUnderwater"
"canXRayStandUp"
"canPartialFloorClip"
"canRJump"