A former OceanGate contractor revealed that the Titan submersible used a hand-typed Excel spreadsheet for navigation, which caused delays and raised safety concerns before its implosion during a Titanic expedition.

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

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

Remember the Titan submersible? Stockton Rush, founder and owner of the underwater tourism company OceanGate, took himself, a Titanic expert, and three tourists on a trip down to