CLEAN : Investigation identifies new suspect in betrayal of Anne Frank

The video discusses a research project initiated in 2016, focusing on a cold case investigation related to Anne Frank. The project involved a team of specialists, including data scientists and historians, who examined extensive archival material and interviewed witnesses. The investigation identified Arnold van den Bergh, a Dutch notary, as a prime suspect based on circumstantial evidence. However, the researchers did not aim to accuse anyone formally. The project, which took six years, is critiqued for not providing a plausible explanation despite the extensive work involved.

What was the main goal of the investigation according to the speaker?

How long did the research project take to complete?