Have you seen this science documentary?

In 2003, when I was 7, when I lived in England, I saw this documentary on Discovery Science.

There were four segments – one on Atlantis, one on Noah’s Ark, one on Bigfoot, and one on the Holy Grail or the Loch Ness Monster, I can’t remember which. At the end of each segment, several people gave their opinions on whether or not they existed, some saying they existed, others saying they did not.

At the time, I believed in all of these things, but, starting in the summer to September of 2010, I stopped believing in them (September being the month when I stopped believing in the Loch Ness Monster, in the middle of my secondary school parking lot when my grandfather was picking me and my elder sister up from school).

Of all of the people who voiced their opinions at the end of each segment (and, indeed, of everyone on the show), I only remember that some of them had North American accents – I do not know if any had British accents. I am not sure how to describe the narrator’s accent, but on thinking of it just now it was either a Boston Brahmin accent or a Transatlantic accent.

Therefore, I do not know if it was an American, Canadian, or British documentary.

It was also the first time when I saw a segment of the Patterson-Gimlin film, although I thought it to be from the 1990s (it was from the 1960s, which I found out in 2005 when I read the Wikipedia article on Bigfoot for the first time), and at the time, I thought it to be real, although I stopped believing it was real in 2010 – I don’t know if it was before or at the same time that I stopped believing in Bigfoot.

Please, do any of you know what this science documentary was?