 On the other hand, out of all the thousands of potential archaeological sites destroyed or grossly eroded by such natural processes, occasionally sites survive with exceptional preservation of a related collection of artifacts.An example of such a collection is .Survival in this instance is largely due to the remains being buried in sediment

Of the many examples where the sea bed provides an extremely hostile environment for submerged evidence of history, one of the most notable, , though a relatively young wreck and in deep water so calcium-starved that concretion does not occur, appears strong and relatively intact, though indications are that it has already incurred irreversible degradation of her steel and iron hull.