Last week, some unlucky Metro passengers were forced to slog through an ankle-deep pool of muddy water as they tried to exit Pentagon Station after the mezzanine level mysteriously flooded the Wednesday before Thanksgiving. The station was closed for a few hours as crews stopped the water flow and cleared the flooding.

Metro was at first unsure about the source of the water, but technicians discovered that the problem was a burst water supply pipe that dates back to the construction of the station in 1977. The line sent water “streaming into the station through air ducts and elevator shafts,” per a Wednesday press release from Metro, damaging some ductwork and causing part of a ceiling to collapse in a service room.

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Metro can’t simply fix the damaged pipe, as it runs underneath the Pentagon and is inaccessible to work crews. So the transit agency is going to have to construct an entirely new water supply pipe, which will cause some changes for riders entering and exiting the station during off-peak hours, according to Metro.

The north side entrance of Pentagon Station will be closed while the new water line is being constructed, aside from weekday rush hour times. The south entrance will remain open at all times for the duration of construction. Per Metro, the entrance closures will not affect train schedules or rail service.

The new water supply pipe is going to take a new route around the station building, the release says. Until the work is completed, the station has no water to service employee bathrooms and maintenance sinks. Employees will have to use portable restrooms.

The Pentagon has already partnered with Metro to help get workers necessary security clearances, per the agency, and it expects to award a contract for the work early next week. There is no timeline yet for when the work might be completed, per Metro.