The website DNAinfo is reporting that an underground leak has been discovered within the World Trade Center complex — and officials fear the seepage may be coming from the slurry wall that separates the newly rebuilt Ground Zero site from the Hudson River.

Workers began to hear the sound of rushing water behind the walls of lower concourses of the complex within the last two weeks, according to sources.

The discovery prompted the Port Authority to quietly call in engineering and construction experts to try to identify its cause, sources said.

Crews were also tasked with dismantling sections of walls and other previous construction along lower subterranean concourses to try to get to the running water and trace its origin. The work is expected to be extremely costly, sources say.

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