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Blindfolded and huddled, one indication of what the British Royal Marines might be facing, these British servicemen, seized by the Iranian Navy off the coast of Iraq in 2004, later released.

A retired American Special Forces officer, who was briefly detained in the Middle East, says the Royal Marines in this case are likely being held in a police or military facility, their possible interrogation.

Bring somebody in, in isolation from his comrades, set him down and start to ask him detailed questions and ask him over and over again, have several people ask the questions in the hope of tripping the person up.

In 2001, Shane Osborn piloted a US reconnaissance plane that collided with a Chinese fighter jets. After managing to land on a Chinese island, Osborn and his crew were held for 11 days. He says they weren't tortured, but:

They used sleep deprivation on myself and tried to get certain information that we weren't willing to give up. And the crew stuck together and made it through, but it was a pretty, pretty scary situation.

How to prepare? Osborn and other former US servicemen tell us about a program called SERE, survival, evasion, resistance, escape, trainees dumped in the wilderness. Those who can't evade capture, taken to a mock POW camp, bound, hooded, and

They locked you up in little cages, and very very hustle interrogations, people screaming and yelling at you. And they hung people up by the thongs for a while.

How are British servicemen trained to resist in captivity?

They make you very cold. They take your clothes away. Sometimes they take your clothes off. And they leave you out in the open. They chain you to, to the ground. They make you kneel with a sandbag on your head, with your hands on your head for a very long period.

That British officer says in his training, if you give away any information beyond name, rank, serial number and date of birth, he was considered broken. The Americans say they were given fake intelligence during their training, and when put through all that mental and physical torture, they were tested to see how long they could hold it in.

Brian Todd, CNN, Washington.