Why ship North Slope Natgas to the Gulf coast?? There is no demand for Natgas imports to the Gulf coast. They are actually building export facilities in TX and LA now to export Natgas to Europe. The desired market for North Slope natgas is Asia. Hence the proposed Canadian project in Kitimat, BC.
The problem with that plan is that there is open water only 2-4 weeks a year. Originally there were thoughts about shipping oil directly from Prudhoe Bay but the open water limitations favored the pipeline. They actually made a publicized trial run but abandoned the idea.