By Pete Muntean, CNN

(CNN) — Six people were killed when a small plane crashed into the ocean off San Diego on Sunday afternoon, the Federal Aviation Administration said Monday.

The final moments before the twin-engine Cessna crash – which triggered a major search of the Pacific Ocean near San Diego – are captured in an air traffic control audio recording from LiveATC.net .

“Mayday! Mayday! Mayday!” the pilot of the Cessna 414 can be heard shouting on the recording only five minutes after taking off from San Diego International Airport.

The pilot and five passengers were killed when the plane crashed into the water “under unknown circumstances,” the FAA told CNN. The Coast Guard is searching a debris field.

An urgent exchange is heard on the audiotape as the pilot tells an air traf

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