Mr. Gapoyan was among the first group of 7 Russians allowed into the water, accompanied by a diving instructor of the company. The group reportedly spent 55 minutes scuba diving in the area, and Mr. Gapoyan did not return to the surface when the allotted time for diving was over.
The Navy has been conducting search and rescue operations in the area, with a helicopter and a number of rescue parties on boats, to no avail.
Ms. Galina Telichkina, the wife of Mr. Gapoyan, said she was married to the Russian man on 16 November and the couple visited Thailand for their honeymoon.
Ms. Galina added that she believes Mr. Gapoyan is still alive because he is a talented diver with extensive experience.