If no luck you may have to dig the trench out.
It is very likely that the conduit is broken somewhere and filled up with debris hence the cables are stuck.
If you want to know if this has happened, do what Don said, and go grab a firehose. If the conduit's broken, you'll see a geyser. If there's a box underground, you'll probably see water bubbling up as it exits the box and creeps up.
Ian A.
[This message has been edited by Theelectrikid (edited 09-03-2006).]
