Rescue workers and volunteers have saved six of seven orcas that became stranded on an Argentine beach.

A person spotted the orcas in the beach town of Mar Chiquita and called authorities early Monday. City workers, firefighters and marine biologists came to help and managed to pull six to safety.

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A woman checks a dead killer whale on the beach near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescue workers and volunteers have saved six of seven orcas that became stranded on an Argentine beach.

A man stands next to a dead killer whale near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Mar Chiquita's tourism secretary Flavia Laguné said the orcas didn't appear to be ill. But authorities plan an autopsy on the orca that died.

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoChristian Heit)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoChristian Heit)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Officials say they're not sure why the orcas beached themselves.

A woman checks a dead killer whale on the beach near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

A woman checks a dead killer whale on the beach near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Mar Chiquita's tourism secretary Flavia Laguné said the orcas didn't appear to be ill. But authorities plan an autopsy on the orca that died.

A man stands next to a dead killer whale near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

A man stands next to a dead killer whale near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoChristian Heit)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoChristian Heit)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)

Rescuers and volunteers work to successfully return a killer whale to the sea near Mar Chiquita, Argentina, Monday, Sept. 16, 2019. Seven killer whales were stranded on the coast before rescuers and volunteers returned six of them to sea, but one died in the process. (AP PhotoMarina Devo)