Wierd...
<i>Journalists taken by Yemeni officials to look at the Limburg report a metre-wide hole, with tangled metal pointed outward, suggesting an on-board blast. </i>
http://news.bbc.co.uk/1/hi/world/mid...st/2308121.stm
Still could have been a bomb smuggled on board and placed in the void between the hulls, I suppose. Supertankers are *big*. Could have been a vapor explosion, too.