The United States said the underwater sound detected during the search for a submersible was reported once every half an hour

Some media quoted the internal memorandum of the government earlier, pointing out that the collision sound was heard every 30 minutes when the ship berthed near the incident area deployed sonar buoys. Four hours later, additional sonar devices were deployed, and the collision sound was still detected. However, it is unclear at present when the collision sound was transmitted and how long it lasted.

The United States and Canada continued to race against the clock for search and rescue. The United States led the operation, which covered an area of about 20000 square kilometers. Canada sent its air force, navy and coastal defense team to participate. The oxygen in the submersible gradually decreases, and the US estimates that it can last for about 30 hours at present.

In addition, a Canadian Navy ship equipped with a mobile pressure regulating chamber and a professional medical team is rushing to the scene. If the personnel in the submersible are rescued, their decompression symptoms can be dealt with. A French research ship also joined the search and rescue.