Classic Honda move right there. Go in for a spark plug and come out needing a whole new block. It's like they know you're already under the hood and decide to just give up entirely. Found a whole connecting rod in the pan of an Accord once on what was supposed to be a valve cover gasket. That job got real expensive real fast.
Lol that's rough, but a connecting rod in the pan is a whole different level of broken. Metal shavings usually mean bearings are toast, not a full rod letting go.