RedactedNarrative: Vessel #1 was being operated by a captain for hire. Owner and captain; along with five additional persons on board were leaving out of Big Carlos Pass for a fishing trip. Vessel left out of a channel with a low outgoing tide passing through an area that has a dredging project. Captain reported he drifted across the pipeline, out of gear at very slow speed, and subsequently struck the pipeline causing damage to both props. The vessel passed between two cautionary signs. Owner terminated their voyage and proceeded slowly to a marine facility where the vessel was pulled from the water and placed on dry dock. The incident was immediately reported to FWC and initially investigated by Lee County Sheriff's Marine Unit who were first on scene. There were no charges, and both parties advised this was a civil matter between the vessel owner and the marine construction company.