quote from a friend of mine with whom I worked together 10 years ago in the same company
and that company builded heavily in China during the following 6-8 years.
"one should forbid them to build ships,if it were not for the cheap building prices due to labour costs and materials"
he said that after he came back from China after the initial sea trials for a 300+m container vessel failed 3 times, they got not even out of the river.
I was on one chinese constructed vessel and I know one thing I don,t want to see any again.
As mentioned in a posting before, I sailed with officers (engineers and nautic alike)from 2004-2008 on container ships and from each one of them who came from 300-350 +m ones, I heard that those 300 + ships "cracks" are the norm. That means not necessarily that they will break, but it happened. Saying now, that it is a proven and sizes don,t matter, can be as big as they want,,thats exactly what was said also in the 70.s
That a big ore carrier makes less pollution than a VLCC in case of disaster is a given.
It was mentioned that in case of the Vale ship that may be it was wrong loaded, possible,,but nowadays with all the computer oversight involved, I would say unlikely. Just on the first time loading most probably the oversight of the loading operations was rather good, complacency comes usually with standard and repeating prodecdures, not when procedures are used the first time. What I know for sure, as long the human element is involved, accidents will happen,,never mind how much automatic/computer control will be installed.