Thousands in Puerto Rico rush for higher ground as large dam begins to fail

The island is still dealing with widespread destruction, lack of power, and no drinking water after Hurricane Maria.
1:52 | 09/24/17

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Transcript for Thousands in Puerto Rico rush for higher ground as large dam begins to fail
Let's turn now to Puerto Rico and the stunning devastation brought by hurricane MARIA. Authorities beginning to get a firsthand look at the destruction. Families cut off with no power, water, or cell phone service. At least ten killed. The imminent threat at this hour, a dam in danger of failing. Thousands rushing to higher ground. Here's Eva pilgrim. Reporter: Tonight, a dire situation. Officials warning this dam in Puerto Rico could fail at any moment. We're encouraging folks to leave. It's going to be difficult to come back and get them. Reporter: Aerial footage showing the spillway overflowing and ripping up everything in its path. Now the dam itself, more than three football fields wide, cracked and threatening to collapse. Rescuers say getting to those in need is difficult. Most of these searchers we're doing, we're doing it boots on the ground. We're walking to it. Reporter: Across Puerto Rico, officials now describing conditions as "Apocalyptic." For five days now, millions cut off from the rest of the world without water, fuel, or power. I know we're not going to get to everybody in time. Reporter: The line for just $20 of gas stretching for blocks. Eight hours waiting for gas. Reporter: As desperation mounts, an argument erupts moments after this gas station shuts down. After a three-hour wait, Bertha Melendez is empty-handed. I'm very mad because this is an emergency. Reporter: Facing months without power, MARIA is now being called the biggest catastrophe the island has ever seen. Authorities watching to see how much water pushes into this collapsed spillway. Tonight, that evacuation is still in place. Tom? Eva, thank you. And hurricane MARIA tonight

This transcript has been automatically generated and may not be 100% accurate.

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