US Coast Guard said boat on the surface lost contact with sub, called Titan, about 1 hour and 45 minutes after it began diving toward site of Titanic's wreckage on Sunday morning.
Private firm OceanGate Expeditions, which deploys submersibles for deep sea expeditions, said in a statement that it was exploring options to bring the crew back safely.
Researchers have captured minute details of the wreckage to create first full-sized 3D scan of Titanic using advanced technology and more than 70,000 photographs.
Admiral Dinesh Tripathi at annual media interaction ahead of Navy Day celebrations announced that an operational demonstration is expected at Thiruvananthapuram, President Murmu to attend.
The India-South Africa series-defining fact is the catastrophic decline of Indian red ball cricket where a visiting team can mock us with the 'grovel' word.
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