That Sinking Feeling (かいぞくせんを やっつけろ！ lit. Attack the Pirate Ships! in Japanese) is the ninth level and is the fourth level of the second warp room in Crash Bandicoot: The Wrath of Cortex. Just like Tornado Alley in the previous chamber, it is via air. However, this time, it takes place in a island surrounded by a volcano and a fleet of ships. Here, Crash uses an unusual flying vehicle called the Firefly. It is the only time the firefly is used in the game.
It's hard to see, but these floating turrets are helping the planes take out Crash.
A close up of one of the floating turrets.
Upon closer examination, the turret is actually a pair of machine guns on a wooden stand controlled by Dingodile. The main gag here is that there are multiple Dingodiles shooting at a single Crash from the water.
Interestingly, the Crash Glider was originally going to be used in this level instead of the Firefly. It was actually a separate version of the glider coded with the same lock-on system as the Firefly. It can be found in the final version through hacking.
Out of all four shooting levels in the game (the others being Tornado Alley, Crashteroids and the boss level Atmospheric Pressure), this is the only level in which the player can be instantly killed (if they bump into a ship).