Interesting...

Israel sends subs through Suez Canal | Israel | Jerusalem Post

IDF sources said the decision to allow navy vessels to sail through the canal was made recently and was a definite "change of policy" within the service. In 2005, then OC Navy Adm. David Ben-Bashat decided to stop sending Israeli ships through the canal due to growing threats in the area.

However, the Dolphin-class submarine sailed through last month to get from the Mediterranean to the Red Sea. Israeli officials said it passed through the canal above water, and that it was not done covertly.