The capsizing of two boats off the Southern California coast in a suspected human smuggling operation that left eight people dead, one of the deadliest maritime smuggling tragedies in the area, illustrated the risks migrants take when undertaking such voyages.

“If your boat is overturned, your chances of surviving in these cold, rough waters of the Pacific are much lower, especially if you’re not an experienced swimmer,” said Tony Payan, director of the Center for the U.S. and Mexico at Rice University in Houston.

Bodies and debris were recovered Sunday from a 400-yard area near Black’s Beach in San Diego after a Spanish-speaking woman called 911 around 11:30 p.m. Saturday saying her small, motorized fishing boat had washed ashore with another boat capsized nearby with eight people aboard.

The accident took place in an area authorities called hazardous even during daylight. Heavy fog hampered Sunday’s search efforts, conducted by the U.S. Coast Guard and U.S. Customs and Border Protection as well as local police and fire-rescue agencies.

Why are such incidents happening?

“When you begin to see people beginning to try to reach the U.S. by boat, this is a sign that something else is failing,” Payan said. “Immigrants are being pushed back into Mexico and being asked to wait indefinitely, and much of Mexico is in the grips of hundreds of criminal gangs that are pretty good at offering quick entry into the U.S. for immigrants who reach a level of desperation.”

He said that was evidenced by an incident Sunday in which a large group of migrants threatened to rush the U.S. border in El Paso, requiring mobilization of the U.S. Customs and Border Protection’s riot control team.

“When there’s no solution to your situation and you’re always in danger of being victimized by crime in Mexico – and then along comes a criminal organization that offers you a way, you may take it,” Payan said. 

What are the risks of illega maritime border crossings?

The risks for such voyages are severe, experts say, often involving overcrowded and poorly maintained vessels purposely piloted in weather providing low visibility to avoid detection.

A makeshift boat confiscated by the U.S. Coast Guard carried Cuban migrants.

Jason Givens, a spokesman for U.S. Customs and Border Patrol, said illegal maritime crossings can be “extremely dangerous” and said the agency urges migrants to enter the country legally.

“Human smugglers treat people as a commodity,” Givens said. “Their No. 1 concern is how much they will be paid, not the welfare of the individuals.”