Actually, a task force of the Royal Liechtenstein Navy was doing ASW (anti-submarine warfare) training in the area. Turns out that the calibration on the RLN's new model of depth charges is a ways off...
"An expeditionary detachment of US Navy ships led by the universal amphibious assault ship USS Kearsarge days ago was in the Baltic Sea
It was 30 km from the site of the alleged sabotage on the Nord Stream-1 gas pipeline and 50 km from the threads of Nord Stream-2 gas pipeline"
(from: https://twitter.com/azmilitary1/status/1574758898086694912)