This is what we found on Wikipedia regarding the SEA LIFE Manchester Entry Ticket:

The Moors murders were a series of child killings committed by Ian Brady and Myra Hindley in and around Manchester, England, between July 1963 and October 1965. The five victims – Pauline Reade, John Kilbride, Keith Bennett, Lesley Ann Downey and Edward Evans – were aged between 10 and 17, and at least four were sexually assaulted. The bodies of two of the victims were discovered in 1965, in graves dug on Saddleworth Moor; a third grave was discovered there in 1987, more than twenty years after Brady and Hindley's trial. Bennett's body is also thought to be buried there, but despite repeated searches it remains undiscovered.

Brady and Hindley were charged only for the murders of Kilbride, Downey and Evans, and received life sentences under a whole life order. The investigation was reopened in 1985 after Brady was reported as having confessed to the murders of Reade and Bennett. Hindley stopped claiming her innocence in 1987 and confessed to all of the murders. After confessing to these additional murders, Brady and Hindley were taken separately to Saddleworth Moor to assist in the search for the graves.

Characterised by the press as "the most evil woman in Britain", Hindley made several appeals against her life sentence, claiming she was a reformed woman and no longer a danger to society, but was never released. She died in 2002 in West Suffolk Hospital, aged 60, after serving thirty-six years in prison. Brady was diagnosed as a psychopath in 1985 and confined in the high-security Ashworth Hospital. He made it clear that he wished to never be released and repeatedly asked to be allowed to die. He died in 2017, at Ashworth, aged 79, having served fifty-one years.

The murders were the result of what Malcolm MacCulloch, professor of forensic psychiatry at Cardiff University, described as a "concatenation of circumstances". The trial judge, Mr Justice Fenton Atkinson, described Brady and Hindley in his closing remarks as "two sadistic killers of the utmost depravity". Their crimes were the subject of extensive worldwide media coverage.