Two people went missing on Saturday after a fishing boat sank in the waters off Jeju Island.

The Jeju branch of the Korea Coast Guard said it received a report at around 9:50 p.m. on Saturday that a four-point-11 ton vessel was submerged in waters 18-point-five kilometers southeast of Seogwipo City.

A South Korean captain and two Indonesian sailors were reportedly on board the ship, with one Indonesian sailor rescued by a nearby fishing boat.

The rescued sailor was hypothermic and transferred to Jeju National University Hospital at around 2 a.m. Sunday and is receiving treatment.

The Coast Guard conducted a search for the two missing people overnight, mobilizing more than ten vessels and four aircraft, including a helicopter, but could not find them.

The Coast Guard is conducting an intensive search on Sunday, mobilizing 17 vessels.