A search for a man who failed to surface after a dive near Moreton Island, near Brisbane, on Wednesday afternoon has been ramped up.
The RACQ LifeFlight helicopter will be joined by more aircraft and boats on Thursday, scouring the area for the 44-year-old.
Police say they have grave concerns for the man.
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He was part of a chartered dive at Henderson’s Rock around 2:20pm on Wednesday.
All the other divers returned to their boat safely.
Authorities and volunteers searched the area overnight without success.