A 52-year-old man died and another man was treated for mild hypothermia after they were thrown into the ocean when their boat struck a break wall near the Santa Monica Pier during a fishing trip Oct. 30, authorities said.

Santa Monica police officers were called at 8:27 p.m. to the 1500 block of the beach to assist harbor guards with a boat that was coming ashore.

Harbor guards told police that they had entered the water and found two men outside the boat, one unconscious and the other floating nearby, Santa Monica police Sgt. Jay Trisler said. The guards brought both men ashore and administered CPR to the unconscious man, in addition to using an automatic defibrillator.

The man, identified as Lewis Anderson of Anaheim, was then transported to a local hospital where he was pronounced dead, police said. The other man, a 42-year-old from Huntington Beach, was also taken to a local hospital where he was treated for mild hypothermia and released, police said.

The two men had reportedly departed from Marina del Rey and were boating near the break water while attempting to catch lobsters, Trisler said. As the boat was drifting, a line apparently became entangled in the boat’s propeller and the boat crashed into the break wall, ejecting the men into the water, Trisler said.

After climbing onto the break wall, the men attempted to swim to the boat as it was drifting toward the Santa Monica Pier, but while they were in the water, Anderson became unconscious, police said. The other man yelled for help until the victims were located by harbor guards.

The police department is investigating the incident as an accidental death.