TY the Tasmanian Tiger

Dive Hard and Dive Harder are levels throughout the game. Dive Hard is in Zone B, and Dive Harder in Zone C. Within those levels, there is a minigame where you have to "dive", and reach the bottom without dying or missing a checkpoint. To do this, simply follow the opal trail all the way down, making sure you go through the blue checkpoints. It may take a few tries for each, but this isn't really that difficult. This should come during your quest to finish the game.