A crowded inflatable dinghy carrying dozens of migrants was seen leaving the French coast near Gravelines, apparently heading across the English Channel towards Britain.
Footage shows the boat moving away from the shoreline in darkness, while one person appears to remain in the water after failing to board.
Further along the coast, several people were seen walking away from the departure area, while a partially inflated dinghy was left near the shore.
Gravelines, close to Calais, is one of the coastal areas used by migrants attempting to cross the Channel in small boats.
The latest footage comes amid continued attempts to reach Britain by sea, despite efforts by French and British authorities to prevent dangerous crossings.
UK Home Office figures recorded 144 arrivals on September 14 and another 55 on September 15. No arrivals were recorded in the provisional figures for September 16 through 18.
However, the figures do not establish whether the boat seen near Gravelines successfully reached the United Kingdom.
The Channel crossing remains a dangerous journey, with migrants travelling in overcrowded and often poorly equipped vessels. Recent international data has also highlighted the continuing risks faced by people attempting sea crossings.
