Extend your sample depth to 3000mm
To use the extension you need to drive in the standard tube to its full length first, then extract the sample and then go down the same hole again and add the joiner and top tube and keep driving to take the remainder of the sample.
A block of timber under the foot jack is handy to get the tube up a bit higher out of the ground to get around the assembly and bolts.
*Image only for illustration purposes, Extension and Joiner made up of 1 x Steel Extension Tube and 1 x Steel Joiner plus bolts. This product does not include the Foot Jack.