diving flashlight is clearly seen attached to the diving belt, secured along with other gear they are getting ready with.
the flashlight is clearly visible around 33:30. If you go to 33:00, you get 30 seconds of the expert diving team hired for the documentary (I assume they didnt purchase “scrubs”, lol) and they are going out to find the archaeological thingy… when you hear the words “metal detector” you know you are right up onto the flashlight part.
i figured the DIVING guys would have fun IDing what flashlight is getting used in cold salt water by the pros?