Friends who were swimming with the Fijian rugby player when he went missing off the Wairarapa coast on Monday say they don't know what went wrong.
Eroni Ravaga-Gaunavou, 22, was swimming with a small group of friends just north of Akitio, 85km southeast of Dannevirke, when he went under the water and did not resurface.
The former Fijian Sevens team member came to New Zealand two months ago to restart his rugby career with the Puketoi Rugby Club.
Dinah Bowie, the wife of club president Bruce Bowie, said Ravaga-Gaunavou's cousins had arrived from Hamilton today as the search continued.
Wairarapa Bush Rugby community rugby co-ordinator Doug Bracewell said: "His friend who was swimming with him said it was cold in the water and when Eroni went under, he did not appear to show any fight.