Reporting indicates the Hong Kong flagged container ship MAERSK REGENSBURG was illegally boarded by one individual. The duty crew on deck spotted the intruder on board removing lashing from a deck. The alarm was raised, and the crew mustered. The intruder fled the vessel in small boat with outboard motor. Vessel search conducted and no other abnormalities noted. One container had one lashing bar removed. All attempt to contact Pilot/shore by VHF 16 failed. All crews are reported safe.