Foul play is suspected and 2 vessels are viewed as potential culprits.

A large NATO operation has been launched in the Baltic Sea today

https://x.com/visegrad24/status/1883542648885231773

AND

Underwater cable between Latvia and Sweden is severed by ‘external influence’ in latest worrying incident in Baltic sea

https://www.dailymail.co.uk/news/article-14327241/Underwater-cable-Latvia-Sweden-severed-sabotage.html