Something else. There's a building near where I work that looks from the outside much like any other in Central London.

It's large, white stone and decorated with a row of carved statues. It's some sort of

government ministry and I've been told that inside it's all columns and

arches and portraits of Victorian generals.

But it's rumored that this building also contains a dark secret.

That somewhere inside there's some sort of forbidden room. But who knows? No one has any idea what takes place there. It's said that it's where things get

concealed, where secrets are kept secret. One of those secrets is the tale of a missing person who disappeared almost 70 years ago,

a diver on a Cold War spying mission.

And the events that unfolded after that day in 1956 will take us on a journey into a world of rogues, royalty, spies and lies.

A journey that takes us right through to the present day.

This story is one of the great unsolved mysteries of the 20th century.

It's so sensitive, so secret, that there are people out there still covering up the truth. And I'm going to find out why.

It all begins with a man named Malik.

You've made it.

Yeah, no, good good to see.

Commander Julian Malik, ex-Navy, Dapper, one of those old-fashioned gents who always wears a tie,

evil men pottering around in his garden shed.

I've been searching for someone like Commander Malik for the better part of 20 years.

You see, he's quite possibly the last living link to this unsolved mystery.

Commander Malik was a Navy diver before he retired, had adventures all over the world,

diffusing mines underwater, that sort of thing, and his heroes were the great wartime divers.

I was thrilled and fascinated by the stories of men principally in the war who went off

...