Tents. The first one in 2009 was a minor grounding where the ship did not even get stuck. It just brushed up against the bank in the sacramento river. Reporter but the latest incident is by no means minor. And now the board, the coast gua guard, and the ntsb are all trying to get to the bottom of it. The Lessons Learned business and you evaluate and go over it with a finetoothed comb. Reporter and we are back here live. You can see the lights of that oil tanker. It remains anchored in the bay as investigators describe it go through it with a finetoothed comb. Now, also, the ntsb has joined the effort. They have an investigator here in the bay area working in conjunction with the coast guard. Also, the coast guard tells me tonight that they conducted alcohol and drug tests on the pilo pilots. They say the results are in on the alcohol test and those results came back negative. Reporting live on treasure island, im jodi hernandez, nbc bay area news. Okay. Thank you, jodi. So why was the