Two more robots have been recovered from the Pike River Mine drift access tunnel this week.
One, named a Wheelbarrow Revolution MK8, was found almost one kilometre up the drift. It went in just before the second explosion in 2010.
It is an army robot and is one metre high and weighs 290 kilograms.
The other was recovered on Tuesday and went in after the second explosion.
It was 953 metres up the drift, weighs 1200kg and is 1.3 metres high and belonged to Water Corporation.
Other robots that have been found so far are an army robot found three weeks ago and another Water Corporation robot.
Many robots were sent in to assess the damage in the mine and never returned following the explosion that killed 29 men on November 19, 2010.