Two lift technicians are in a critical condition after the lift they were repairing collapsed and fell 15m, Durban paramedics said.

Netcare 911 spokesperson Chris Botha said technicians were repairing a lift at the Checkout supermarket in Umzinto.

"The lift gave in and the two technicians were in the lift at the time. The lift fell 15m.

"The two technicians sustained multiple injuries and both are in a critical condition," he said.

Botha said both the technicians are in their early twenties.

One was airlifted to St Augustine's hospital and the other was taken to Kingsway hospital.