Something else.

In the weeks that followed Lionel Crabb's disappearance in Portsmouth Harbour, there were lots of theories as to what might have happened, and the most credible was that he ended up in the Soviet Union.

You'll remember how Crabb wartime diving buddy Sidney Knowles was

convinced he was going to defect. And there's Margaret Crab, she was sure her ex-husband

was living in the Soviet Union.

And there's also the claim from an unnamed Soviet officer that Krab was being held in a Moscow

prison. And then 50 years after Lionel Crab went missing, a very different story emerged from the Soviet Union.

And once again, it's hard to know if it's true or false.

It's centered on a man nearing the end of his life, a man named Edward Coulstoff came forward and claimed to have been a KGB agent aboard Krustoff's vessel back in 1956.

More importantly, he was one of only two eyewitnesses who saw Crab on the morning he disappeared.

There's quite a bit about Koltzov online, even a photo, and he looks quite distinguished with thinning silver hair and an angular nose, and he's wearing a smart dark blue jacket.

So I call up my researcher in Moscow, Marsha, my friend with the cropped air and silver rings, ask

if she can find out more about him, root around on the Russian language internet, stuff

I can't access here in the UK.

Okay, no problem.

I've got contacts on that world.

So I'll do some digging and I'll let you know as soon as I find anything.

This is exactly what Marsha's good at, using her network of people in the know.

I am sure there will be something. Let me see what I can do. Brilliant, you're an absolute star as ever.

I am. Okay. All right, see you.

Thank you soon.

Bye. And just a few days later, she gives me a call. She's got some information about

...