>> couvillion: yes, sir.ould be laying on its side, just below us. >> wertheim: his engineering company has conceived of and installed a system to help contain a stubborn oil spill. it's directly below this spot, nearly 500 feet underwater. >> couvillion: if we didn't have g.p.s. coordinates, we wouldn't know that we had a functioning system that was actively collecting 1,000 gallons of oil a day. >> wertheim: catch that? an average of 1,000 gallons of oil a day, that would otherwise be contaminating the gulf of mexico. it's being captured by timmy couvillion's system and transferred to these tanks to be sold later as recycled oil. >> couvillon: 100,000 gallons is a major oil spill. this is seven major oil spills that we've collected, since april of 2019. >> wertheim: how many years you been doing this? >> couvillon: two years. >> wertheim: the mouth of the mississippi forms the heart of louisiana commerce. this region is nourished by a mix of fish, water, gas and oil. but increasingly, both the terrain and t