Original: Observers point to the Explorer's 1969 expeditionary cruise to Antarctica as the frontrunner for today's sea-based tourism in that region.
Simplified: Chile dispatched the icebreaker Almirante Viel, and nearby commercial ships including the MN Ushuaia, the National Geographic Endeavor, and the Norwegian Coastal Express ship MS Nordnorge which was operating as a passenger cruise ship at the time.