The IDF’s submarine flotilla has seen a sharp increase in the number and duration of its at-sea operations, with a special focus on Israel’s northern neighbor Lebanon.

According to a senior Israel Navy officer, 58 percent of the navy’s submarine flotilla’s time at sea in 2013 were in operational deployments, while the remaining 42% were for training purposes. That marks a dramatic increase from the three previous years, when submarines spent just 36% of their time at sea in operational deployments.

The navy’s submarines also conducted 54 special operations in 2013, a similarly sharp increase from previous years. The operations included deployments to the Lebanese coast and deployments lasting several weeks that took the submarines thousands of kilometers from Israel.