Aqua Pass

The Aqua Pass was a planned map for the 2014 game Crash Bandicoot Cortex Island, in which harbored level 2 after N Sanity Wasteland. According to 2091riveraisrael, it was said that Crash Bandicoot had used this very tunnel in order to gain entry to Uka Uka Village on Cortex Island, to begin his quest for revenge for the destruction of his home N Sanity Island by destroying the Neo Cannon, followed by giving Dr Neo Cortex a good Pounding.

This Under Sea Tunnel was once a supply route used by Neo Cortex before the creation of Crash Bandicoot, in which he used to move his evil experiments from in and out of Nsanity Island, but the tunnel was abandoned after the events of Crash Bandicoot 1996, and Crash's take over Nsantiy Island.

Crash eventually finds this route that some how survived Nsanity's destruction due to it being under the water and uses this exact tunnel to get all the way to Cortex Island.