Record-breaking rain has killed dozens of people and forced thousands to evacuate.

Record flooding has killed at least 18 people in parts of Thailand and authorities have dispatched warships and helicopters to support relief efforts.

Floods hit 10 southern Malaysian provinces last week, and the city of Hat Yai, a business hub bordering Malaysia, recorded the heaviest rainfall in 300 years, reaching 335 mm in a day.

Photos showed cars and homes submerged in water in the city, while desperate residents waited for rescue on rooftops.

Incessant rains have also devastated neighboring countries. In Vietnam, the death toll rose to 91 in a week, and in Malaysia, more than 19,000 people were driven from their homes.

In Thailand, more than 2 million people have been affected by floods, but only 13,000 have been moved to shelters.

According to Reuters, the majority are out of touch and unable to get help.

The Thai military, in charge of responding to the crisis, said it was preparing to dispatch an aircraft carrier, a flotilla of 14 ships carrying relief supplies, and a field kitchen capable of delivering 3,000 meals a day.

The Navy said medical teams aboard the aircraft carrier would convert it into a “floating hospital” if needed.

The governor of Songkhla province, where Hat Yai is located, said boats, cargo trucks and jet skis were also deployed to evacuate residents.

The cabinet on Tuesday declared Songkhla a disaster area and secured relief funds.

But many people remain stranded in rising waters.

Matchima Rescue Center, a volunteer rescue group, told Reuters it had received thousands of calls from people requesting evacuation over the past three days.

People also posted urgent calls for help on Matchima’s Facebook page. “Many people are trapped… please help,” one user wrote. “It is very difficult now. The water has reached the second floor where children, elderly people, patients and disabled people are located!!!”

Another person wrote that his family had been waiting for help for three days. “Every moment counts now. Please share. My (phone) battery is at 40%. Thank you all.”

Some people wrote that they had been without food or water for several days.

A video that has gone viral on social media shows three young boys clinging to power lines, inch by inch to safety, as murky brown water continues to rise below them.

In Malaysia, more than 19,000 people have been evacuated to safety and 126 evacuation centers have been set up in the northern border region.

In the states of Kelantan and Perlis, rescue teams waded through knee-deep floodwaters and evacuated residents from areas where rising water levels had cut off road access.