A Venezuelan natural gas platform has sunk in the Caribbean Sea. This was announced today by President Hugo Chavez through the social networking site Twitter. <br/><br/>Mr Chavez said the Aban Pearl platform sank in the early hours this morning and all the 95 workers were evacuated safely. He said two navy boats are now patrolling the area. <br/><br/>Venezuela's energy minister said the sinking of the drilling rig posed no risk to the environment.<br/>