Tom dug up the turf. Underneath was a concrete lid with a metal handle. He hooked it with a crowbar and lifted.
A blocked soakaway is rarely broken—just suffocated. Give it air, give it movement, and most of all, give it patience. And keep a set of drain rods in the shed. how to clear a blocked rainwater soakaway
To avoid future blockages, consider the following: Tom dug up the turf
Thump. He hit something soft. He twisted the rods, pushing and pulling. After ten minutes, a plug of mud and sludge popped free, and murky water burped out. give it movement