"We are now working with the SCDNR to recover the vehicle", Horry County Sheriff Phillip Thompson says.
They've been using high-water vehicles and other equipment to rescue dozens of people.
The mayor of Nichols, South Carolina, says his tiny town is underwater again.
A resident surveys a road inundated by water in Lumberton, N.C., Tuesday, Sept. 18, 2018, following flooding from Hurricane Florence. The sheriff's office didn't immediately confirm that was the case for that van.
Horry County Sheriff Phillip Thompson identified the deputies as Stephen Flood and Joshua Bishop.
The two individuals being transported were confirmed dead by the Marion County coroner.
Justin Bamberg, a state lawmaker and lawyer who has represented the families of several people injured or killed by law enforcement officers, said Wednesday he's perplexed by the decision to transport anyone in such uncertain weather conditions.
The paper reported that a therapist chose to commit Green, a mother of four, after she showed up for a counseling session on Tuesday morning.
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It was reported early Tuesday that the Pee Dee River was rising above flood stage and spilling its banks and roadways were flooding but some passable. "Due to unsafe conditions and rising waters, additional search and rescue teams are arriving to assist in the recovery of the vehicle".
The van was traveling west on USA 76 east of Nichols about 5 p.m. on Tuesday. Officials say the van was traveling near the Little Pee Dee River, one of the bodies of water officials in SC are watching closely as water continues to poor into the state from upriver in North Carolina following the heavy rains of Florence.
"The two deputies attempted to extricate the persons being transported". Their names have not been released.
Thom Berry, a spokesman for the State Law Enforcement Division, said SLED agents have been sent to the scene to investigate. That effort resumed Wednesday morning, but Thompson said a specialized crew was being flown in from Charleston to assist.
"I'm not sure if it was the way the van was positioned, against a guardrail, or if it was pressure from the water, but unfortunately they were not able to get the van doors open and get the ladies out", Thompson said.
Forecasters predict some rivers in the northeastern area of the state might not reach their highest levels until later this week or next week.