That's twice that I've read comments about the possibility of hitting containers. Granted, I don't know much about sailing, but I'm curious if this is a peril to actually be concerned about? (Do ships hit containers often?) On one hand, I'd think you'd certainly want to keep an eye out. On the other, how likely are you to see what I imagine would be a partially submerged container?
Ships hit boats on occasion, but sometimes the only evidence is an unidentifiable piece of railing wrapped around the bow bulb spotted by the pilot as they finish a transocean cargo run.
Again, steel gives you a chance here, but note that this boat's mast was snapped off by the concussion.