The never-before-seen footage, released on Tuesday, depicts the Dover RNLI crew responding to a mayday call when a dinghy with 19 individuals onboard sank.
All of the migrants were successfully rescued from the water by the volunteers, who threw flotation devices and helped them onto the lifeboat.
The RNLI reported responding to 114 separate crossing incidents in 2024, saving the lives of 58 migrants, including children.