There have been investigations and video inspection of the wreck. "Everyone" agrees that the official explanation is correct. The reason for covering the wreck

There have been investigations and video inspection of the wreck. "Everyone" agrees that the official explanation is correct. The reason for covering the wreck is that the disaster was a major national catastrophe; if 800+ hadn't died it would never have been considered. Says Wikipedia: "In the aftermath of the disaster, many relatives of the deceased demanded that their loved ones be raised from international waters and given a land burial. Demands were also made that the entire ship be raised so that the cause of the disaster could be discovered by detailed inspection.[27][28] Citing the practical difficulties and the moral implications of raising decaying bodies from the sea floor (the majority of the bodies were never recovered), and fearing financial burden of lifting the entire hull to the surface and the salvage operation, the Swedish government suggested burying the whole ship in situ with a shell of concrete.[29][30] As a preliminary step, thousands of tons of pebbles were dropped on the site.[28] The Estonia Agreement 1995, a treaty among Sweden, Finland, Estonia, Latvia, Poland, Denmark, Russia and the United Kingdom, declared sanctity over the site, prohibiting their citizens from even approaching the wreck.[31]"