other. Eyewitness testimony can be inaccurate at times, and many persons have been convicted on the basis of perjured or otherwise mistaken testimony. Thus, strong circumstantial evidence can provide a more reliable basis for a verdict. Circumstantial evidence normally requires a witness, such as the police officer who found the evidence, or an expert who examined it, to lay the foundation for its admission. This witness, sometimes known as the sponsor or the authenticating witness, is giving direct (eyewitness) testimony, and could present credibility problems in the same way that any eyewitness does. Eyewitness testimony is frequently unreliable, or subject to conflict or outright fabrication. For example, the RMS Titanic sank in the presence of approximately 700 witnesses. For many years, there was vigorous debate on whether the ship broke into two before sinking. It was not until the ship was found, in September 1985, that the truth was known. However, there is often more than one logical conclusion naturally inferred from the same set of circumstances. In cases where one conclusion implies a defendant's guilt and another his innocence, the "benefit of the doubt" principle would apply. Indeed, if the circumstantial evidence suggests a possibility of innocence, the prosecution has the burden of disproving that possibility. Examples Much of the evidence against convicted American terrorist Timothy McVeigh was circumstantial. Speaking about McVeigh's trial, Robert Precht said, "the prosecution's use of indirect evidence is no cause for worry". McVeigh was sentenced to death and subsequently executed by the US federal government, while his accomplice was sentenced to serve consecutive federal life sentences. The 2004 murder trial of Scott Peterson was another high-profile conviction based heavily on circumstantial evidence, leading to Peterson's being sentenced to death (he was subsequently spared the gallows and currently awaits re-sentencing). Another case that relied on circumstantial evidence was that of Nelson Serrano, who received four death sentences for four first-degree murders. The 2015 murder trial of Ivan Chan Man-sum from Hong Kong was a conviction based solely on circumstantial evidence without finding the body of his murdered girlfriend. Chan was consequently sentenced to mandatory life imprisonment. In Singapore, law student Sunny Ang was sentenced to death in 1965 solely based on circumstantial evidence when he was convicted of murdering his girlfriend during a scuba diving trip near Sisters' Islands on 27 August 1963. The victim, Jenny Cheok, was murdered for her insurance money, which amounted