I heard the Vistafjord used to go right next to the ice in the Arctic and passengers would step onto it.
Both Sagafjord and Vistafjord had ice strengthened hulls.
I have done two trips on Vista when we went up as far as the ice edge, once in beautiful sunshine and once In sea mist with very limited visibility.
For both occasions there were strict safety procedures in place, we very slowly approached and just gently nudged the bow up against the ice edge a couple of times, before pulling away slowly to a safe distance before turning around and heading off south!
A remarkable experience on what was a remarkable ship. I think that the Captain on both occasions was Capt. Leif Rodall (" I'm so proud to be your Captain").
As has been said, Vista & Saga were both built with strengthened bows that allowed for just such occasions, something I don't think any modern ship, expedition ships excepted, have.