A major Tokyo Olympic venue, Sea Forest Waterway in Tokyo Bay, which is to host canoeing and rowing events suffered huge damage after it was ‘plagued’ by a sea of oysters.
The unwanted visitors have costed organisers $1.28 million in emergency repairs.
Massive numbers of them had attached themselves to floats intended to stop waves bouncing back across the water and on to the athletes.
The oysters were discovered when puzzled officials began investigating why the floats had started sinking.
Solving the problem has been a huge and time consuming task.
Equipment laid over a span of 5.6km either had to be dragged ashore and repaired, or cleaned in place by teams of divers. In total, they removed 14 tonnes of oysters.
And these weren’t just any shellfish. Officials found they were magaki oysters, which are a hugely popular delicacy during the winter in Japan.
While the prices of oysters vary around the world, the ones found could be worth tens of thousands of dollars.
The Sea Forest Waterway is the only international standard rowing course in the whole country.
With a budget of only about $1.5 million a year to keep it afloat after the games are over, authorities better hope they find a long-term solution to their expensive oyster problem.