Tests with ships will begin in mid-2015 on a new set of locks that are a key component of an expansion of the Panama Canal, the waterway’s chief said on Sunday.

The expansion, which involves building a third set of locks onto the 50-mile (80-km) waterway, was originally scheduled to be completed this year, but has been delayed several times, in part due to a dispute earlier this year because of about $1.6 billion in cost overruns.

The deadline for completion is now January 2016.

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