The pair left Oamaru yesterday afternoon for a day-long four-wheel-driving trip between Naseby and Otematata, but friends became concerned when they failed to return.
Dansey's Pass is a mountain road located in the Kakanui Range.
A police spokeswoman said the duo made contact with police this afternoon and a four-wheel-drive team was being sent to assist them.
"At this stage we are not sure why they were not able to drive out of the area without assistance," she said.
"There are no reports of any injuries.
"Police are expecting to have reached the couple before it gets dark."
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That's us!
We're very lucky to have been rescued by the wonder people at the search and rescue in Oamaru. The reason we were unable to get out is because our 4WD got stuck in soft mud in a place where not many people venture. Very grateful to be back in civilisation.