Sir Ben Ainslie's America's Cup challenge has been hit by a bomb scare.
Construction work at his syndicate's state of the art headquarters in Portsmouth was halted overnight by the discovery of an unexploded World War Two bomb.
The bomb was found under an existing concrete floor slab as investigation work got under way ahead of piling and foundations for the massive building.
British media reported that the area was cordoned off for two hours while the device was removed by a Royal Navy bomb disposal squad.
The discovery of bombs was not unusual in Portsmouth given its rich naval history.
Work on the $150m base for Sir Ben Ainslie Racing began late last month and construction was planned to be completed by next May.
Ainslie has been granted government funding for his team's challenge.
He was part of Oracle's winning team last year, securing a tactician's role midway through the American outfit's successful comeback in the final against Team New Zealand in San Francisco.
Ainslie resisted staying with Oracle to launch a British challenge for the next cup, which would see the final raced in 2017.
Ainslie was keen to host America's Cup world series build up events in Portsmouth.
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