Transcript for Puerto Rico, still without power after Hurricane Maria, now at risk of dam failure
We want to move now to the latest on that dire situation in Puerto Rico where a dam could collapse at any moment putting 70,000 people in harm's way. This is a serious situation and compounding the misery, the entire island, no power. ABC's Victor Oquendo is right there. Reporter: Good morning. Those floodwaters can be devastating and deadly. Tens of thousands of people are being told to get out. Here in San Juan, the winds created all this damage. A new imminent threat forcing 70,000 people in Puerto Rico to evacuate their homes immediately. A crack discovered in a dam, its surrounding area pummelled by 15 inches of rain. Officials warning those in the area to move to higher ground, fearing it could collapse at any moment. This crises as desperate cries for help continue across the island. With communication nearly impossible -- I haven't spoken to anyone since midnight on Tuesday. Reporter: Hundreds of cars pulling over on a highway, one of the only places with cell services. Even stars like Jennifer Lopez -- We haven't been able to hear from our families. Reporter: Ricky martin. Donate whatever you can. Reporter: And Marc Anthony -- Puerto Rico needs your help. Reporte not able to connect with their loved ones. We have had a lot of people from the United States reach out to us saying they haven't been able that get in touch with their loved ones in that port of Puerto Rico. We're desperate for their WHE whereabouts and they're doing fine. Reporter: Inside an Thoen ytonio and Julie safe and sound, just without power or any anywway to communicate to the outside world. Do you have a mess saage to your son? I love you. Reporter: We've been in touch with his family in Miami. They are incredibly relieved. For so many others they're stuck waiting for word.
This transcript has been automatically generated and may not be 100% accurate.