It said the activity was "suggestive, but not conclusive, of preparations for an upcoming test of a Pukguksong-3 submarine launched ballistic missile from the submersible test stand barge."
The Knesset plenum voted 54-25 to reject a request by Yesh Atid-Telem for a commission of inquiry to investigate Netanyahu's role in the submarine affair.
To date, Iran has violated the 2015 nuclear deal limits on uranium enrichment, but has not enriched above the 5% level.
“None of the international pacts ban using peaceful nuclear energy but the peace we are talking about doesn’t find meaning without maintaining defense readiness," Rear Admiral Khanzadi said.
The S43 submarine is the third out of four new submarines ThyssenKrupp sold to Egypt, after getting Netanyahu’s approval.
The Submarine Affair has jumped to the forefront right before next week's election.
Other top defense officials: Additional submarines were corrupt/nonsensical
"This supplemental capability strengthens deterrence and provides the United States a prompt, more survivable low-yield strategic weapon," said John Rood, undersecretary of defense for policy.
Attorney-General Mandelblit and Justice Minister Ohana continue to fight over Shai Nitzan successor.
This incident could have long-term consequences as it may be perceived as part of Russia's attempts to intervene more in the region after the Syrian civil war.