A necklace 'made from the tooth of a megalodon shark' has been revealed in new images from the wreckage of the Titanic. br br The stunning artefact was identified in footage taken last summer by Guernsey-based firm Magellan Ltd.br br The footage was shot during efforts to capture the first digital scans of the shipwreck, which present it in detail - almost as if it's been retrieved from the water. br br Other objects surrounding the necklace have not been identified, although it appears to be near a collection of small ring-shaped beads. br br Magellan Ltd, which is working with Atlantic Productions on a documentary about last year's expedition, is prohibited from retrieving them from the sea floor, however.