This cache can be done as a cache and dash and there is room to park at the field entrance (along as you leave room for the farmer to get in and out). The hatch to the post is unlocked and you will need to descend to find the cache. The floor is a bit bumpy/lumpy at the bottom of the ladder but once past that it is suprisingly dry and OK. You may need a torch... I dare you to go down, close the lid and turn off the light...
This is the second cache in this location. The original cache can be found here: GC4VWGZ Observation point: Harston ROC.
The first was outside but this is inside...