The main lobby of the Mermalair is a counter-clockwise loop. The loop intersects at one point, the end of the level being above the intersection point.
Thanks to an oversight by the developers, the end of the lobby is low enough to grab the ledge with a well-spaced double jump. This allows the player to skip navigating the entire loop and climb to the end of the level. With an active Cruise Boost, lobby skip can be done with a bash.
If the player misses the ledge-grab, there is a backup strategy that can be performed. By climbing up a few stalagmites behind the ending platform, the player can reach the top after falling off.