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"No parts or remains have been found, and the search is ongoing," Esperance Police Sgt. Allan Keogh told CNN.
"Gary was my rock," Milligan said in a statement. "He was a kind, gentle, strong man. He only ever saw the best in people. He will be so truly missed by me, by his family and his friends and the world will be a poorer place without this most beautiful man."
Esperance Police and marine rescue volunteers were deployed to search the ocean for the victim.
"He and I were at home in and on the ocean," Milligan said. "We would go out diving in our boat whenever we could, most weekends. We took photos, not fish. We were always aware of the risks, and often told each other that if we were attacked by a shark, that would just be unlucky. We were completely against shark culling, and I still am."
Milligan said both she and Johnson believed if fish stocks were "better protected," the risk of sharks to people in the waters would be reduced. Johnson had also dreamed of having a Marine Park in the Esperance area, according to his wife.
Esperance is located about 720 kilometers (447 miles) southeast of the state capital, Perth, and is a popular spot for diving.
There were two non-fatal shark bite incidents off Western Australia in 2019, a spokesperson for the Department of Primary Industries and Regional Development told CNN.