There are plenty of ways of getting down in a hurry, but you need to be proficient to do it safely due to close proximity of the granite! One other method is to get on the back of the drag curve....I.e. slow right up, so you are just above stall. This causes a lot of drag and lower forward speed so you get quite a steep angle of decent with low airspeed.
I would stress this is advanced stuff and to do it safely you need to know your aeroplane 100% and be 100% sure of your abilities, but you could always ask your FI to show you.