Any idea when the batteries will catch on fire, and the ferry will sink? The article doesn’t say.
Side point: Submarines used to run on battery power when submerged. But those boats were designed and run by serious adults. That’s almost certainly not the case here.
I’ve been on a small car ferry across the Potomac River once when the cable broke. It was pretty scary floating around. This sounds ridiculous.
Submarines never ran on Lithium Ion batteries.