Marine Rescue Rockingham have issued a warning to skippers after a yacht ran aground off Shoalwater.
The crew were rescued from the yacht, which ran aground on Shag Rock, between Seal Island and Penguin Island, on Wednesday afternoon.
The damaged yacht has since broken up overnight and debris is floating around Seal Island and inshore along Shoalwater Marine National Park.
"Much of this debris are large jarrah sections not easily visible, and presents a risk to vessels or watercraft operating around Seal / Penguin Islands or the Shoalwater Coast," Marine Rescue Rockingham's Facebook read.

Yacht debris off Shoalwater. PIC: Marine Rescue Rockingham
Locals are also concerned about a fuel and oil spill coming from the yacht.
"This spill is within a few hundred metres of the breeding/feeding ground of the critically endangered Little Penguin, the breeding ground for pelicans, the migrating bridled terns who fly all this way to breed on these few islands, the Sea lions the marine life is endless out there and all will be affected if they come in contact with any of the leaking contaminants," Hands Off Point Peron Facebook group said.
It is not known when the yacht will be recovered.

Albanese announces $1.1 billion in road upgrades for Kwinana's Westport development
Drivers escape injury after head-on crash south of Perth
Whale carcass attracts sharks close to shore off Dawesville
Digital drivers' licences to be introduced in WA
Mandurah FIFO worker wins $250k
2026 ANZAC Day services across the Peel and Rockingham regions
Mother of 11-year-old boy killed in Mandurah scooter crash found safe and well
Peel charity desperately seeks funds to keep doors open
Australind train service set to resume