I believe it is significantly underestimated. Figuring out the unit count of the number and concentration of these vessels is very challenging, especially for submerged vessels. I think there are probably thousands of these vessels that have not been identified through aerial survey work and that sort of thing. I'm personally not sure of the best way to survey the quantity or number of vessels out there right now, but I know that more survey work needs to be done.
On November 18th, 2024. See this statement in context.