cement blocked in a copper u trap for bath drainage

A plumber I used (who I can't find now) fully blocked my copper drain pipe with concrete he used while setting a new bath tub. I've tried high pressure hose, and an 'eel' to no avail. Any suggestions would be most greatly appreciated.

 

beleive it or not concrete sets better in water, sorry new pipe.

and before anyone says it will fall apart before it sets, it cant because its in a pipe

 

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