During normal operations and dependant on depth of water available the "pond snorkel" will normally be dropped from the hover from a 3500lbs electrically operated cargo hook mounted on the port side aft of the main gear from a hieght of around six feet to ten feet from the main gear.
I have photos and film of both Pond & Sea Snorkel's in operation from inside the Crane but no means of attaching them to site !!