Do not worry, in the extremely unlikely event we have a malfunction with the main parachute there is a backup ready to go.
As part of the FAA regulations, all tandem parachute jumps must be made with a single harness, dual parachute system with both a main and a secondary, or reserve, parachute. Basically, if one doesn’t work, you have a backup. The reserve parachutes are inspected and repacked on a strict timetable by an FAA-certified rigger whether they’ve been used or not. The main parachutes are inspected and packed by a rigger or experienced packer every time after use. In addition, all tandem parachutes must have an AAD (automatic activation device) which will deploy if the both the student and or tandem instructor fail to activate either the main or reserve parachute.