French frigate Méduse (1810) - Incompetent captain leaves 147 souls to their fate on an improvised raft for eight days, after which cannibalism ensued, and only 15 remained alive

You're not fooling.

On the eighth day, the fittest decided to throw the weak and wounded overboard, leaving just 15 men remaining, all of whom survived another four days until their rescue on 17 July ...

"Incompetent captain invites passenger to navigate, who promptly mistook the clouds for African mountains and plotted their course dangerously close to shore. Said captain then put the rich people on life boats and everyone else on an improvised raft (that had been built to put cargo on in hopes the ship would come off the shallows), but cut them free after they realized the raft was dragging them out to sea. He caused the death of over 140 souls."

How's that?

I remember obsessing about this tragedy a few months back when That Chapter covered it. Bleak barely covers it. I seem to recall reading that multiple crew members were concerned about the course from the start, and had they spoken up (if they didn't) or been heeded (if they did), there'd be no story here.