German news agency dpa said workers were excavating ground to build changing rooms when they discovered the four-by-four metre block.

https://twitter.com/History1History/status/932887839909597184

Members of the sports club at the Hein-Kling stadium in the city’s Billstedt district said the Nazi monolith served as a foundation for a monument that was torn down decades ago.

City officials say they want the swastika gone as quickly as possible.

But because it is too heavy to be transported away, they are planning to destroy it with jackhammers.