IFREMER and RMS Titanic Inc., the successors to the sponsors of the 1987 expedition, returned to the wreck with Nautile and the ROV Robin in June 1993. Over the course of fifteen days, Nautile made fifteen dives lasting between eight and twelve hours each.[45] Another 800 artefacts were recovered during the expedition including a two-tonne piece of a reciprocating engine, a lifeboat davit and the steam whistle from the ship's forward funnel.[46]