Big Shaker is the third boss in Sonic the Hedgehog 3 and Sonic 3 & Knuckles and is found at the end of Act 1 in the Hydrocity Zone. The boss is giant sphere with rockets circling around it.
Knuckles caught in the whirlpool
The Big Shaker first rolls around in the boss area, meaning Sonic
must jump or dash out of the way whilst the boss is in this stage of attack. Once it has done this it stops just above the water on top of a pole which it causes to spin and creates a whirlpool in the water. Getting caught in the whirlpool will cause the player to be unable to move at will until the Big Shaker has stopped spinning. However, it is when the boss is on top of the pole that the boss is vulnerable and can be attacked.