Almost as deep as the list of people who were on the MTA payroll for this project until an auditor came in and could not find any reason why they were being paid

Edit: It was around 22% of the payroll in 2017. Hundreds of people being paid $30,000 a month for no identifiable reason. https://www.nytimes.com/2017/12/28/nyregion/new-york-subway-construction-costs.html

"Nobody knew what those people were doing, if they were doing anything," said Michael Horodniceanu, who was then the head of construction at the Metropolitan Transportation Authority