whoa! Maybe so.......
This anchor was blown from the S.S. Grandcamp when this ship blew up on April 16, 1947, while moored at Texas City Terminal docks. The anchor, which weighed approximately 3200 lbs. originally, was projected from the ship to a point on Pan American property at 2000-S and 2160-E, sinking about 10 feet into the soil in landing. The distance traveled from the ship to point of landing was 1.62 miles or 8575 lin. ft.
http://www.hmdb.org/Marker.asp?Marker=50168
It is no surprise a large amount of ammonia nitrate, after being in a fire, would cause such a large explosion.