The desperate five-day search and rescue operation to locate the Titan submersible tragically halted last week when large parts of the vessel were found at the bottom of the ocean.
Despite the input of submarine experts and the use of sophisticated technology, including drones, remote operated vehicles (ROVs), and ships, there is much left to discuss.
From the size of the debris baffling coastal guards to the undetected noise of the implosion and the delayed response, mystery still shrouds much of the catastrophic tragedy.
