mark, as much as I know these german u-boats are fueled with hydrogen, and their way of moving is told to be very silent. they can stay and operate under water for a long time. Diesel and batteries are only additional. They could be the base for bombing nuclear facilities in Iran, no planes needed. This must never happen, but like this it seems technically possible.
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Livni: Shaked's annexation bill would lead to bi-national state with Palestinian majority in Knesset
from the article: Report: Israel to deploy nuclear-armed submarines off Iran coast