UPDATE: Police believe a teen has drowned at a quarry at New Chum, near Ipswich.
Emergency services were called to the quarry after reports the boy disappeared below the surface after jumping into the water-filled quarry.
The boy had jumped from a high ledge, resurfacing briefly before sinking back below the surface.
Police divers and QFES swift water rescue technicians are searching for the boy but grave fears are held for him.
Police are asking members of the public to avoid the area whilst officers and other agencies conduct the search.
Officers are also advising the public to avoid trespassing on private property and swimming in unpatrolled and unsecure areas including quarries.
EARLIER: Police are currently searching for a swimmer who is feared drowned after he jumped into a quarry and never resurfaced.
The boy, 16, is believed to have jumped into the quarry at New Chum around midday and has not been seen since.
There are currently a number of police crews on scene.
It is believed the lake is on private property.
More to follow.