The search for a missing boater who placed a mayday call on Thursday saying his vessel was flooding continues, the U.S. Coast Guard said Sunday.

The boater said his vessel was taking on water and was in danger of sinking about 46 miles west of Kailua-Kona near the Alenuihaha Channel, the Coast Guard said.

Ron Ingraham, 67, is believed to be the only person aboard the 25-foot sailing vessel Malia which departed Kaunakakai Harbor in Molokai to Manele Bay, Lanai.

Ingraham’s friend called the Coast Guard and said the last time he spoke with him was on Tuesday.

Watchstanders at the Sector Honolulu Command Center received a mayday call over VHF radio at 8:03 a.m. Thursday.

Crews have searched 7,789 square miles so far.