From the most recent BC cable ferries news release:
For Immediate Release
16-047 September 24, 2016
SPIRIT CLASS VESSELS TO BE CONVERTED TO CABLE OPERATION DURING MID LIFE UPGRADES
BC cable ferries’ Spirit of British Columbia and Spirit of Vancouver Island will be converted to primary cable operation during their scheduled mid life upgrades in 2017/18. The work will be undertaken by Remontowa Ship Repair Yard S.A. of Gdansk, Poland.
Using a complicated network of cables, pulleys, and WD-40, BC cable ferries will lay a network connecting Swartz Bay cable ferry terminal in Sidney to Tsawwwassen Terminal in Delta. Fine cables will be manufactured by skilled German craftsmen, in only yards confirmed to have no part in World War II German U-Boat construction.
Safety is the number one priority at BC cable ferries, and plans have been crafted for every possible situation. If all three cables were to break, a backup propulsion system using only clean BC natural gas can safely bring the cable ferry to the nearest terminal.
While the Spirit class vessels are out, passengers can expect to see lots of construction through the Southern Gulf Islands routes. Delays are to be expected and BC cable ferries suggests finding alternate travel routes, such as HarbourLink cable ferries from Downtown Vancouver or Seaspan cable ferries from Delta.
BC cable ferries looks forward to bringing the newly upgrade Cable of British Columbia and Cable of Vancouver Island to service in early 2019.
Under contract to the Province of British Columbia, BC cable ferries is the service provider responsible for the delivery of safe, efficient and dependable cable cable ferry service along Cable British Columbia.
You didn't mention the giant "transit light" towers that will be built at Tsawwassen and Swartz Bay, visible from all of Georgia Strait. When the lights are red, the CABLE OF BRITISH COLUMBIA and CABLE OF VANCOUVER ISLAND are in transit, and no marine traffic may cross the cable path, including the SKEENA QUEEN.