yeah i heard about this aswell.
where i live we get alot of these "heritage" videos on the tv from time to time, where commercial breaks would be.
one was about this explosion. aparently there was a calm before the explosion in between the crash and the explosion.
one man saw the problem, knowing what the one ship was carring (hordes of ammunition) and ran to the train station. he sent out over morse code a message telling an inbound train to stop. he succeeded meer seconds before the ships exploded.
the main problem was alot of people ran to the windows to see what was going on in the harbour so when the ships exploded thousands of people were blinded and scared for life by shards of glass.