Valentina Novozhyonovam, 23, has gone missing during her trip to Thailand’s Koh Tao island since February 15. An ongoing investigation suggests she might have had an accident while free diving – her favourite hobby.

Koh Tao is a part of Surat Thani’s Pha Ngan district.

Surat Thani Governor Uaychain Innak orders that the search continues, with police and various units co-ordinating their efforts to locate her both in the sea and in the land.

The search on Sunday focused around Poh Ta Toh peninsula in the Chalok Ban Kao Bay. It’s one of the most popular diving spots.

Novozhyonovam’s mother has flown to Thailand after learning that her daughter went missing.