Yes, SOSUS detected the "anomoly" when it happened...
Published (updated) this morning in the NYTimes...
By Eric Schmitt
Published June 22, 2023
Updated June 23, 2023, 6:29 a.m. ET
The U.S. Navy, using data from a secret network of underwater sensors designed to track hostile submarines, detected “an anomaly consistent with an implosion or explosion” in the vicinity of the Titan submersible at the time communications with the vessel were lost on Sunday, two senior Navy officials said on Thursday.
But with no other indications of a catastrophe, one of the officials said, the search was continued.
The data from the sensors was combined with information from airborne Navy P-8 surveillance planes and sonar buoys on the surface to triangulate the approximate location of the Titan, one of the officials said. The analysis of undersea acoustic data and information about the location of the noise were then passed on to the Coast Guard official in charge of the search, Rear Adm. John Mauger.
Because there was no visual or other conclusive evidence of a catastrophic failure, one of the officials said, it would have been “irresponsible” to immediately assume the five passengers were dead, and the search was ordered to continue even though the outlook appeared grim. Both of the Navy officials spoke on the condition of anonymity to discuss operational details.
It was not immediately clear how widely the Navy’s acoustical analysis was disseminated among the search team, nor why the Navy had not made it public earlier. The Navy’s acoustic analysis from the secret sensor network was first reported by The Wall Street Journal.