Six beachgoers were rescued from rip currents off of Isle of Palms Thursday, one day after a man drowned.

Bystanders alerted a lifeguard trainer, who was in her office Thursday, that the six were caught under the pier at around 2:30 p.m.

Lifeguards at the Isle of Palms County Park are not on duty during weekdays until Memorial Day.

The swimmers had been pulled into deep water under the pier by rip currents and were found holding on to a pylon, according to the park manager Cynthia Wilson.

Two swimmers were able to get out of the water on their own, according to Isle of Palms Fire Department Chief Ann Graham.

The lifeguard trainer was able to pull another two swimmers from the water before the Isle of Palms Fire Department rescued the remaining swimmers, said Graham.

One person was transported to a hospital by EMS, Wilson said. The 17-year-old was taken to the hospital for evaluation and in stable condition, according to Charleston County EMS officials.

On Wednesday, a 22-year-old man was pulled from the surf by bystanders at 1:30 p.m. near 22nd Avenue on Isle of Palms.

Jermaine Choice, of North Charleston, then received CPR in an attempt to resuscitate him, officials said.

Choice was transported to East Cooper Medical Center in critical condition, but he later died at the hospital, according to Charleston County Chief Deputy Coroner Bobbi Jo O'Neal.

The Charleston office of the National Weather Service put out a warning about rip currents off the Isle of Palms after Wednesday's incident.

Wilson said they are seeing an increase in the number of rip currents.

"The topography of the beach is strange because there's a sandbar off the shore," Wilson said. "It's creating rip currents almost every day."

Wilson urges non-swimmers to stay out of the water and for all swimmers to be well-informed about rip current safety. She said swimmers should always be accompanied by another person.

For more information about rip current safety, visit ripcurrents.noaa.gov/overview.shtml.

Christina Elmore contributed to this report.

Reach Natalie Caula Hauff at 937-5594 or Twitter.com/ncaula.