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The Kulkalgal man recalls a day in 2017, when his son recovered the washed-up remains of his great-great-grandmother while playing in the sand.
Less than three metres above sea level, Masig's sandy shores are slowly being eaten away by rising tides.
The scientific predictions give the Torres Strait's low-lying islands, including Masig, until 2050 before they become uninhabitable.
"When I was young, the island was here," the 43-year-old says, using the sand as a slate to draw a line.
Five years later, in 2022, Mosby was among eight Torres Strait Islanders who won a UN human rights ruling against the Australian government over climate change inaction.
Over the past decade, the federal and Queensland governments have invested millions in the Torres Strait Seawalls Program, installing thousands of sandbags to mitigate coastal erosion.
One way Traditional Owners are seeking to take back control of their future is by establishing a new Indigenous Protected Area. Unlike other conservation zones, such as national parks or marine reserves, IPAs are voluntarily declared and managed by First Nations Australians.
Officially, it covers the 11 uninhabited coral cays surrounding Masig, but much of the conservation work extends to the island too.
Mosby hopes it will give Masigalgal people, the Traditional Owners of Masig, an advantage in the race to save the island.
Formerly known as Yorke Island, Masig is a coral cay in the Torres Strait's Central Islands cluster.
After eight years of planning, the Masigilgal IPA was dedicated in July 2025 and now covers 245 hectares of land.