Most European HVDC projects involve submarine cables.
Links to project pages: DolWin2 HVDC Light, NordBalt HVDC Light, EWIC HVDC Light, BorWin1 HVDC Light, DolWin1 HVDC Light, NorNed, Fenno-Skan, SAPEI, Valhall HVDC Light, Estlink HVDC Light, Troll HVDC Light, Italy - Greece, Skagerrak, Tjaereborg HVDC Light, Gotland, Gotland HVDC Light, Hellsjön HVDC Light, SwePol, Baltic Cable, Kontek, Konti-Skan