rail in the tube, BART reported a reduction of noise and positive feedback from riders. Marine traffic Ship traffic passing through the Bay can damage the anodes used in the Tube's cathodic protection system when dropping anchor. Since the anodes protrude from the filled trench surrounding the Tube, they are more vulnerable to damage. Marine traffic is restricted from dropping anchors when over the Tube, but BART conducts routine inspections for anode damage. The Tube was closed briefly on January 31, 2014, after a drifting freighter dropped anchor near it at 8:45 a.m. to maintain position. The Coast Guard notified BART officials the anchor appeared to be close to the Tube at 11:55 a.m., based on the ship's position, leading to a suspension of Tube service for approximately 20 minutes while inspections were conducted. No damage was found, and the Tube was reopened at 12:15 p.m. Harbor pilots later noted the ship had anchored southwest of the Tube. Two trains that had been passing through the Tube were stopped in place while the inspection was conducted. Trains were delayed by 15 to 20 minutes, with normal service resuming around 1 p.m. In April 2017, the derrick barge Vengeance, which was working for BART performing Tube anode maintenance, capsized and sank at night during a late winter storm. The barge came to rest atop the fill overlaying the Transbay Tube, but did not disrupt transit operations. The primary concern was the potential leakage of diesel fuel, and divers had stopped the leak within a day. Future In 2007, as BART celebrated the 50th anniversary of its creation, it announced its plans for the next 50 years. Determining the current tunnel will be at its operational capacity by the year 2030, the agency has plans which include a new separate Transbay Tube beneath San Francisco Bay that would run parallel to and south of the existing Transbay Tube. The proposed four-bore tunnel would emerge at the Transbay Transit Center to provide connecting service to Caltrain and the planned California High-Speed Rail (CHSR) system. The second Tube would provide two tracks for BART trains, and two tracks for conventional/high-speed rail (the BART system and conventional U.S. rail use different and incompatible rail gauges and operate under different sets of safety regulations). In 2018, BART and CCJPA, the agency responsible for Capitol Corridor commuter rail service, began planning to conduct a feasibility study to