As the title addresses, what causes silt deep inside wrecks? Here in the Great Lakes, the water inside the wreck is so still, that not even zebra and quagga mussels can survive. That means that no dead, living, or decaying organisms can get inside the wreck, but yet when you get inside of them, there is 6 inches to 2 ft of silt on the bottom. I understand that when a hull slams into the floors of lakes and seas that some sediment cannget inside, but can't be that great of an amount. Also decaying metal flakes off at varying rates, but again not in such a great amount to cover the "bottom" with inches of silt. So does anyone have an answer to this? Interesting thought at least to me.