He has also been a long-term scuba diver and underwater photographer - exploring ocean shipwrecks, enjoying interaction with marine wildlife and also venturing into flooded subterranean caves. His photography has been published in the journals of the National Geographic Society, Australian Geographic Society and various diving and photography magazines. He has just self-published his first book "Ocean of Self" (An ocean diver explores the nature of consciousness), available only at present as an eBook.