Also as the tanker was loaded the ballast tanks would have been empty, AIS gives the bulker draught at 12.8m so loaded. Once the hill was punctured very little to stop damage to the double hull.
From todays Lloyds List:
"A SEARCH continued on Monday for the crew of a damaged Iranian tanker still at risk of an explosion that could sink it following a collision at the weekend with a bulk carrier.
The 164,154 dwt Panama-flagged Sanchi was carrying 136,000 tonnes of fuel to South Korea when it came into collision with the Hong Kong-flagged 75,725 dwt CF Crystal bulk carrier carrying 64,000 tonnes from the US off Shanghai on Saturday night. The bulk carrier had been heading to Guangdong province.
In a statement, the Shanghai Maritime Safety Administration said the search and rescue operation was ongoing. Iran’s Ports & Maritime Organisation said a body had been found.
The crew comprised 30 Iranians and two Bangladeshis, according to Lloyd’s List Intelligence.
Three rescue vessels, four public service vessels, two anti-pollution ships, four merchant vessels and a number of fishing boats are on site to provide assistance.
Meanwhile, the Korean Coast Guard has also sent a vessel to help with the rescue work, according to SMSA.
The administration added that the collision had resulted in an explosion on Sanchi’s hull as well as an oil spill near by, resulting in a massive fire that forced the vessel to list to starboard.
Experts from the rescue group said there was the possibility that the entire tanker vessel could explode and sink. They also warned that the toxic gas emitted by the fire could result in serious injuries for rescue workers.
Iran’s Ports & Maritime Organization as well as National Iranian Tanker Company have launched investigations into the incident.
PMO managing director Mohammad Rastad said the remains of a crew member had been found and had been transferred to Shanghai port to be identified.
The oil tanker was chartered by a South Korean company named Hanwha-Total Petrochemical Co.
When approached by Lloyd’s List, an HTPC official expected the incident to lead to about $60m in losses on the cargo, which should all be covered by insurance. The official declined to comment further.
SMSA has established a restricted navigation zone, with a 10 nautical-mile radius to prevent further incidents. China’s ministry of transport has set up an emergency working group to oversee the rescue work and investigations.
The other ship, CF Crystal, which sustained only minor damage, has headed to the nearby Luhuashan port under the custody of a rescue vessel.
All 21 crew members of the bulk carrier were rescued.
The US Navy’s 7th Fleet dispatched a P-8A aircraft to help out in the search and rescue efforts, it said in a statement on Sunday.
“After arriving on scene, the aircraft searched an area of approximately 3,600 square nautical miles before returning to Kadena Air Base in Okinawa, Japan. None of the mariners were located,” said the US Navy."