/*New Zealand*/'s prime minister has warned the nation to prepare for the worst as there is still no viable way to reach the trapped men.
They were deep in the mine in /*Greymouth*/ when a blast ripped through the cavern Friday.
A bomb-disposal robot that was sent into the Pike River mine to assess conditions and learn the fate of the men short-circuited and failed Tuesday when it hit water. Officials said that replacements were being flown in.
A team is working on a narrow hole in an area where the miners might be. Once completed, the 500-foot-long shaft will sample gas levels and determine if rescuers can finally move in.
The Associated Press Contributed to this report.
