You can get those cheap waterproof USB cameras off ebay. Might save you digging.
Can you get a piece of thin steel rod down there from the manhole? Might be able to give it a tap on the end.
Otherwise it sounds like a spade job to me.
Can you get a piece of thin steel rod down there from the manhole? Might be able to give it a tap on the end.
Otherwise it sounds like a spade job to me.