A former OceanGate contractor said that the company used a partially manual system to track the submersible.They would first transcribe the details into a notebook and then transfer it to Excel, she said.

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.