A third Russian made it to shore. According to:
nu.nl/algemeen | Zoektocht naar vermiste duikers gestaakt
he stated that they swam away from the reef after a large shark. The current was south to north and they got swept away. Normally the current is north to south and the boat was waiting at the south end of the reef.
This news bulletin also states the search has been stopped, due to weather and the unlikely chance of still finding a survivor.
Robert