SAN DIEGO -- A 24-year-old Navy SEAL was recuperating Thursday after becoming weak and dehydrated and getting lost while training in the Laguna Mountains, authorities said.

Cal Fire, the San Diego County Sheriff's Department and San Diego fire- rescue came to the SEAL's rescue Wednesday night, Cal Fire Capt. Mike Mohler told The San Diego Union-Tribune.

The SEAL, whose name was not released, failed to report back to a rendezvous point with the rest of his group of about 50 Wednesday night, according to Mohler.

The Navy asked for help from firefighters and a sheriff's helicopter about 8 p.m. Wednesday, he said.

About 40 minutes later, the SEAL used a strobe signaling device to get the sheriff's helicopter crew's attention in the area of Big Laguna Lake and Los Huecos Road.

Firefighters couldn't reach him and the sheriff's helicopter crew was unable to hoist him out of the area, so a San Diego fire-rescue helicopter was called in about 9:30 p.m., Mohler said.

About 10:30 p.m., the SEAL was hoisted about the San Diego fire-rescue helicopter and taken to a hospital.