Taking the subway? Make sure to pack a lifeboat!

Heavy rains caused titanic-level floods at several Big Apple train stations Thursday — forcing some desperate New Yorkers to wade through subterranean lakes just to get on with their commute.

Shocking video showed a woman walking into waist-deep water as she attempted to reach the platform at the 157th Street No. 1 train station in Washington Heights.

The "pour" straphanger had water up to her ankles as she descended the stairs — before she plopped into the underground pond. She continued moving, undeterred, holding a shopping bag over her head.

Another commuter at the same waterlogged station was also caught-on-camera trudging through the subway pool on his way out. Video showed him moving through knee-deep water, a plastic bag on his head.

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"Yooo the 157th St station is underwater," one person wrote on Twitter, along with video showing a deluge on the street above the train stop.

Another user tweeted: "Wow @mta flooded train, no AC, feels like a sauna, trying to get on safety so no one slips and the conductor is mad we are not getting on fast enough. What a mess. Nothings changed."

Flooding was also reported at the 191st Street No. 1 train station and at the 125th Street station — where video showed water pouring onto the platform and onto an incoming train.

At the 149 Street – Grand Concourse station in the Bronx, torrents streamed down a staircase, turning it into a waterfall.

"Stairs looking like a water park ride right now," wrote the Instagram account "Subway Creatures."

The underground inundation took place as the city was placed under a "severe thunderstorm watch" by the National Weather Service, set to last through 9 p.m.

The Big Apple is expected to continue getting drenched on Friday, as Tropical Storm Elsa moves through the region.

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An MTA spokesperson said the agency was looking into videos of the flooding.

To read more from the New York Post, click here.