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.

OceanGate’s Titan submarine relied on ‘idiotic’ Excel spreadsheet - Former employees tell hearing into sub’s implosion last year that they raised safety concerns

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.

OceanGate used a hand-typed Excel spreadsheet to track its ill-fated Titan submersible, according to a former ­contractor for the firm.

A former OceanGate contractor claims teams would hand-write notes and input data into Microsoft Excel spreadsheets to help track the vessel.

"The whole system was absolutely idiotic," Antonella Wilby, a former OceanGate contractor, testified at a Friday hearing on the Titan submersible.