I’m not sure exactly how to achieve a rippling distortion for the player camera, to display when they are underwater.
If anyone could point me to any docs or offer any tips, it would be much appreciated. Cheers
You need to make an unlit transparent material with some kind of distortion in it (you might also want to multiply the destination color by the tint of the water). Place that material as a material effect in a post process chain (and you might also want to add a blur effect). Create a post process volume wherever your water is, and insert your post process chain.
A search for “UDK underwater post processing” should bring up more detailed steps.