During a recent US Coast Guard Marine Board of Investigation hearing, Wilby revealed that OceanGate relied on an Excel spreadsheet to map the submersible’s navigation. Furthermore, the data was manually entered by hand into the Excel spreadsheet.

A former OceanGate contractor, Antonella Wilby, testified before a U.S. Coast Guard panel on Friday that the company’s Titan submarine, which imploded last year during a dive to the Titanic’s wreckage, relied on an incredibly convoluted navigation system.

A hearing into OceanGate’s Titan sub, which imploded during an expedition to the wreck of the Titanic last year, revealed that its navigation system allegedly relied on team members manually inputting the coordinate data into a spreadsheet in order to track the vessel.