The fishing cutter caught the unexploded German ordnance in the sea around the island of Bornholm, which lies just south of Sweden, the Bornholm Tidende news website reports . A navy bomb disposal team met the boat as it docked in the harbour in the town of Nexo, after the crew called ahead to report what it had aboard. It was then given a thorough cleaning by the Danish Emergency Management Agency (DEMA), in case any of the mustard gas had escaped, the website says. "The bomb was well preserved," says DEMA spokesman Michael Gronbech-Dam, adding that it is about 90cm long. Mr Gronbech-Dam say it's unlikely the gas has leaked, but officials aren't taking any chances.