I'd be interested to hear more about your friend's pollen idea and how this correlates to early human activity
I would like to hear more about it too, but alas, I'm a layman trying to regurgitate what that man told me.
From what I was able to understand, human intervention in an area like pre 1795 Oak Island, would leave tell tale traces of their visit. Pollen from their clothes, activities, digging, environmental conditions and habits would be suspended in the silt in the swamp and those who know how to conduct these tests can read information from it like a book. I also recall that this is not horribly expensive.
Aside from that, I am fairly convinced the swamp is a somewhat virgin area from exploration. Fred Nolan as we all know tried to drain the swamp, then abruptly gave up. So, the swamp has not been well explored. I envision, bottles, broken tools, bones (from meals) discarded materials and even some tailings from excavation work. Can you imagine the rush of excitement if someone were to find a pile of broken (previously excavated) anhydrite bedrock in the swamp, a shoe buckle, sword, lance, or a four hundred year old bottle or dish.
I know we have some folks on the forum who used to dive around OI. What does the bottom look like? Soft sediments? Hard bottom? Sand?
You can get all those conditions all around Oak Island, it is not consistently the same al around the island. For instance, in the cove that separates OI from mainland Western Shore and the Resort, there is a lot of mud. Off Isaac's Point, (near Smith's Cove) the bottom is rocky for a stretch, then a gravel/mud mix. Off the nor'eastern shore, between Oak Island and Chester, the bottom is scoured gravel, then later muddy. Lots of current here too.
A friend of mine found an old ship's sounding lead with the tallow hole in the bottom on that last mentioned bottom. It was almost covered in sediment and according to one marine biologist I consulted who knew the area, that sounding lead would have had to have been there a long time to get covered over.
So, the ocean bottom off OI still has some secrets to divulge and that is open game for anyone to explore. Mind you, if you find a treasure (not likely) the last Treasure Trove License issued for the island off those areas, held out for a 300 foot perimeter.