Pete Michell heads out into Boston Bay off of Port Lincoln - one of the worlds largest natural deep water harbours. There are some great ways to get out on the bay and last year Chris Dittmar took a trip with Adventure Bay Charters to go swimming with the Tuna. If you're not keen to get wet, Pete discovers you can now view them face to face thanks to an underwater viewing platform.

Adventure Bay Charters
Port Lincoln
0488 428 862
www.adventurebaycharters.com.au