Satellite data analysis firm report 2 yrs ago: 2 ships with transponders turned off were spotted near Nordstream pipeline just days before explosions. Director of NGO Baltic Security Foundation: This is rare unless the vessels had “clandestine objectives”.
https://www.businessinsider.in/international/news/2-dark-ships-were-spotted-near-the-nord-stream-pipeline-leaks-days-before-the-explosions-were-detected-satellite-data-analysis-firm-says/articleshow/95508667.cms