Four mariners were rescued in dramatic fashion from a tugboat that was sinking in Sabine Pass, Texas, on Friday.The U.S. Coast Guard said its watchstanders at Sector Houston-Galveston command center were notified at 5:38 a.m. that the crew of the 71-foot tug Sea Cypress hailed mayday on VHF-FM channel 13 and reported they were capsizing while moored near the mouth of the Sabine Pass channel.Watchstanders issued an urgent marine information broadcast and directed the launch of…