Subsea tiebacks are much cheaper than dry tree wells, principally due to the fact they do not require a new platform and facilitate the better use of existing infrastructure. Additional production from subsea wells feeding a host platform may, · Extend the potential life of the host facility, · Generate better host facility economics by spreading host facility’s fixed cost over more barrels of through-put added from the subsea tie-back, and · Facilitate production that would be otherwise uneconomical to produce stand alone. In addition to cost saving, an operator can avoid the cost and environmental impact of constructing a new platform, which in some instances may require upwards of a hundred thousand tons of steel, one of the most energy-consuming and CO2 emitting industrial activities in the world. Discussion topics include: 1. Role SSTB play in increasing production while also reducing overall development CAPEX 2. Lower overall carbon footprint of SSTB keeping host platforms full, longer, amortizing fixed costs over a greater volume of production 3. Technical challenges of ever-longer SSTB, changing chemistries to meet viscosity challenges of long distance, high pressure 4. Challenges, technical and commercial of PHA when separate ownership of host and SS well, how this varies around the different basins.