What do you do if that parachute doesn't open either?

Answer 1

There are several different types of malfunctions possible on a parachute while it is deploying. Everybody jumps with a spare parachute, known as a reserve. The parachutist identifies the type of malfunction and either cuts away the main parachute and deploys the reserve or if a cutaway isn't necessary just deploys the reserve straight away. Please note that cut away doesn't mean you have to cut all the lines with a knife, there is a pad that you grab and pull down which releases the main parachute.

Answer 2

cut the main chute and deploy your reserve

Answer 3

Flail your arms and legs wildly in all directions.

Answer 4

Jumping to a cuchjin