Expert Comment
Emeritus Professor Ian Tuersley on the missing Titanic submarine
Efforts at this stage are focused on trying to locate the vessel by listening for noises generated by the trapped crew, detected using sonar buoys – with a number of these having been deployed by rescue aircraft. If the noises can be picked up by more buoys it will help to narrow the search area considerably but the operation has been realistically compared to looking for a needle in a haystack.