A second attempt was made on 11 February when US Navy explosive experts placed 39 shaped charges to breach the top of the fuel tanks from within the cargo holds. 602 U.S. gallons (2,280 L) of napalm and nearly 397 pounds (180 kg) of plastic explosives were also used to ignite the fuel on board. The ship burned for approximately 33 hours.[8] Additional smaller-scale attempts were made to burn more oil over the next two days, with limited success.