Southport To Whitehaven (Inc. The Isle Of Man) (S03E03)

Miranda embarks on a quest to locate the largest sharks lurking in British waters. Meanwhile, Mark takes a closer look at the Royal Navy's cutting-edge 'Attack' nuclear submarines, which remain shrouded in secrecy. Alice encounters a woman who spent her childhood in the Isle of Man's internment camps during World War II, where individuals deemed 'enemy aliens' were confined in Britain.