“Our ship was purpose-built for rugged and safe expedition voyages. At just under 250 feet, she has a particularly shallow draft and an ice rated double hull which enables her to forge into marine territories that elude other more cumbersome ships. Her go-anywhere size also makes her intimate”
http://www.smallgrouptours.net/MS_Explorer.html
can’t get much more “intimate” than a double hull.. I had heard early on that a fist-sized hole was punctured somehow..
Ironically, it was the first custom-built Antarctic cruise ship, and the first cruise ship to visit the Antarctic. It was also the first cruise ship to navigate the northwest passage without help of an icebreaker.