Some 3,902 square metres of coral was destroyed after the boat became stranded in the Tubbataha marine park -- a UNESCO World Heritage-listed coral reef -- the park management said.
"The damage the Chinese vessel caused to the reef is heart-breaking," Angelique Songco, the head of the marine park said in a statement after experts assessed the affected area.
Some of the coral destroyed by the Chinese vessel was 500 years old, Songco said, adding that the damage was much larger than the area destroyed when a US Navy minesweeper, the USS Guardian, got stranded on Tubbataha in January.
Authorities later found hundreds of dead pangolins, an internationally-protected species, hidden inside the vessel.
Tubbataha marine park information officer Glenda Simon told AFP the 12 Chinese would likely be fined about 95 million pesos (USD 2.32 million) just for trespassing into the marine park and destroying the coral.
The government has already charged them with poaching and they could face an additional 12 to 20 years in jail for possession of the pangolins in violation of wildlife law.
The Philippine office of the World Wide Fund for Nature condemned the poaching of the pangolins after the men were caught, saying that growing demand in China was wiping the animal out in Southeast Asia.
