Run away ! it's a tree stump !
The workers initially thought the hard object they dug into could have been a Second-World-War-era bomb - a relatively common find in the German capital, much of which was turned to rubble during the war.
The workers reported their find at 10:15 a.m. local and Berlin's Reinhardtstrasse was closed to traffic for about 45 minutes as police investigated.
In one of the more spectacular past bomb finds, a 250-kilogram British bomb was plucked from under the lower ring of seats at Berlin's Olympic Stadium in 2002 as it was undergoing renovations - the same stadium where the July World Cup final will be played.