The three basic approaches for removing the oil from the water were: combustion, offshore filtration, and collection for later processing. USCG said 33×10^6 US gal (120,000 m3) of tainted water was recovered, including 5×10^6 US gal (19,000 m3) of oil. BP said 826,800 bbl (131,450 m3) had been recovered or flared.[153] It is calculated that about 5% of leaked oil was burned at the surface and 3% was skimmed.[113] On the most demanding day, 47,849 people were assigned on the response works and over 6,000 Marine vessels, 82 helicopters, and 20 fixed-wing aircraft were involved.[3]