Finnish authorities boarded and searched a target vessel in the Baltic Sea in a live drill that officials said shows how seriously the region takes the threat of undersea sabotage ▻ ↧ Finland practices ship boardings at sea to stop undersea sabotage Finnish authorities boarded and searched a target vessel ‌in the Baltic Sea on Thursday in a live drill that officials said shows how seriously the region takes the threat of undersea sabotage after a string of incidents.