What looks to be a modern storm/ surface water run off in to the River Dearne. A tight squeeze and a soaking in to roughly 4ft RCP with two choices, left and right, with several smaller side pipes entering along the way.
The left pipe leads a short way to a 2ft RCP.
The right pipe breaks halfway to outfall the main source of water in here which was entering at a decent speed, not too sure where this is coming from. Following this the 4ft RCP continues up an incline and ends in a room with a small pit in the middle for collecting the water running in from two further pipes built higher in to the wall.
Short and sweet with sketchy levels of O2 towards the end.