South Australian student was on a school tour when he became wedged and spent a few hours underground before being freed from the Naracoorte cave

Olive oil to the rescue after Adelaide schoolboy gets trapped in cave crevice

Olive oil helped free a schoolboy who spent several hours stuck in the crevice of a South Australian cave.

Police say the 12-year-old Adelaide boy was on a school tour of the Naracoorte cave on Thursday when he became wedged in a crevice about 3pm.

Emergency service crews were called at 5.30pm to help pry him out of the spot, about 15 metres underground, after several failed attempts from others.

The crews chipped away at the rock and used a harness and some olive oil to free the boy by about 8pm.

He was assessed at the local Naracoorte hospital, where he stayed overnight, and had only minor grazes.

A spokeswoman for his Aberfoyle Park primary school, the Pilgrim school, said his teachers had been impressed by his bravery and the efforts of the emergency workers.

She said the cave tour was part of a school camp, which the boy is expected to rejoin on Friday.