What is a “base jump”?

A base jump refers specifically to jumping from fixed objects, such as buildings, antennas, spans (bridges), and earth (cliffs). This distinction is significant because base jumping is typically done at lower altitudes compared to skydiving, which involves jumping from aircraft.

The nature of base jumping presents its own set of challenges and risks, as the jumper must deploy their parachute shortly after leaving the object due to the relatively low altitude available. The equipment and techniques used in base jumping can also differ from those in traditional skydiving.

The other options involve methods of jumping from vehicles or group jumps but do not fit the definition of base jumping, reinforcing that jumping from fixed objects is a unique activity within the larger context of parachuting and skydiving disciplines.