The Polar Plunge is scheduled once during each voyage. Throughout the journey, the Expedition Leader and Captain constantly monitor conditions in order to choose the optimal time and location. The Polar Plunge sometimes takes place onshore or, in many cases, from the gangway or Zodiac. All participants wear a tethered harness and plunge into the polar waters from the side of Zodiac or safety of the gangplank cheered on, of course, by fellow passengers and Expedition Team. Safety is paramount—the onboard physician always attends the Polar Plunge. Guides in survival gear circle the area in Zodiacs as guests take their turn jumping or cannon-balling into the polar waters.