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Carry the oil and dispersants far from the source. >> 219 feet, we're collecting a sample. >> reporter: morning dive number 3791, in an area known as the ledges. the goal to gather baseline data like scoops of sediment, corals and sponges, all samples that build snapshots of the before in case later, oil shows up. if there is oil here now, they know they're collecting evidence for the federal government that later may be challenged in court by bp. >> i think the pressure i feel is to make sure we're collecting samples in a way that if we have to legally defend what we've done in the future, we...

Visual signs of the oil. >> reporter: this is day 13 of their month-long mission. we're on the edge of the so-called loop current. an undersea highway that may carry the oil and dispersants far from the source. >> we're collecting a sample. >> reporter: morning dive 37.front. the goal to gather baseline data like coral and sponges that build snapshots in case oil later shows up. if there is oil, they know they're collecting evidence for the federal government that later may be challenged in court by bp. >> i think the pressure i feel is to make sure we're collecting samples in a way that if we...

>> reporter: this is day 13 of their month-long mission. we're on the edge of the so-called loop current. an undersea highway that may carry the oil and dispersants far from the source. >> 219 feet, we're collecting a sample. >> reporter: morning dive number 3791, in an area known as the ledges. the goal to gather baseline data like scoops of sediment, corals and sponges, all samples that build snapshots of the before in case later, oil shows up. if there is oil here now, they know they're collecting evidence for the federal government that later may be challenged in court by bp. >> i think th...