ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins60% CONFIDENCEOverall confidence: 60%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidenceTrade press (oedigital[3], Northern Ocean) reports the rig was delivered from Hyundai Heavy Industries in June 2019, without naming an exact day.
The harsh-environment semisubmersible West Bollsta, bought by Northern Drilling for $400 million, was towed from a South Korean shipyard to Norway by the ultra-powerful tug ALP Striker.