It seems that they all died

Ten Somali pirates captured by Russian Marines when said Marines boarded a Russian Tanker to rescue the crew were set adrift in an inflatable raft with no navigational aids.

"It seems that they all died," the unnamed source was quoted as saying by Russia's Interfax news agency.

Russia initially said the 10 pirates would be taken to Moscow to face criminal charges over the hijacking, but they were released instead because there were not sufficient legal grounds to detain them, the defence ministry in Moscow said.

I guess it was easier than a trial.