Haapalah / Aliyah Bet

Yochai Fishman Bin-Nun's parents were members of the First Aliyah.

Yochai Fishman Bin-Nun was born in Haifa and raised in Jerusalem.
The New York Times Obituary cites: Yochai Bin-Nun was born in Jerusalem in 1924.
He was named after his grandmother on his fatherś side, "the one who ran away with Chakir the Tatar":, whose name was Haya

Yochai Fishman Bin-Nun and his parents moved from Haifa.

Yochai Bin-Nun was one of the most capable infantry squad leaders in the Palmach פלמ"ח, noted for his prowess as "a sapper with a keen knowledge of explosives.”

The Palyam פלי"ם‎ No. 3 Small Boat Commanders' course:
The course prepared seamen, who would serve in bringing Maapilim to Palestine.
Platoon leader:
* Gad Lasker
Instructors:
* Menachem 'Churchill' Cohen
* Zalman Perah
* Avraham Zakai
Attendees:
* Levi Aniv
* Yochai Bin-Nun
* Shaul 'Shuli' Oren
* Yosef Schwartzman Shachar
* Shmuel Yanai
* Hanan Yones
Levi Aniv cites: "The aim of the course was to prepare seamen who would be useful in the bringing in of future immigrants of the Aliyah Bet. We had a great deal of practice in rowing, sailing, and navigation."
The three boats on the Yarkon River that were used were Dov דב‎, Rivka רבקה and Tirza תרצה, one of which is now in the Clandestine Immigration and Naval Museum מוזיאון ההעפלה וחיל הים ע"ש דוד הכהן in Haifa חיפה.

in 1945, Abraham Zakai, commander of the Palyam פלי"ם, asked Yochai Ben-Nun to form a unit within Palyam פלי"ם will deal with the Royal Navy, and create disruptions in British naval operations against the Haapalah.

Zahal.org.il cites: "The hostilities begun on October 29th when forces from Great Britain, France and Israel launched the so called "Operation Musketeer"."
"Israeli Navy headquarters in Haifa sent a three ships task force to patrol and defend the long coastline of Israel. Two Z class detroyers, INS Yaffo and INS Eilath together with the old frigate, INS Miznak were patrolling the sea about 32 miles south west to Haifa when the Egyptian destroyer sneaked into the bay and at 03:30 begun shelling the city of Haifa."
"The Israeli task force under the command of Captain Shmuel "Samek" Yanai is informed about the attack and is turning north in order to engage the Egyptian destroyer. The slower frigate Miznak is left behind and out of the chase while the Yaffo under the command of Commander Yohai Ben-Nun and the Eilath with Commander Menahem Cohen in charge are speading in 30 knots to the assumed course of the Egyptian flag ship."
"Captain Yanai is determined to utilize his supremacy and end the battle as soon as possible, before the expected intervention of the Egyptian Air Force. Ibrahim El Awal returns fire but her gunners fail to hit their targets. The Israelis on the other side, firing massive salvos of shells are hitting their target causing the Egyptian destroyer severe damages."

In 1956 during Kadesh Operation מבצע קדש, Shmuel 'Samek' Yanai commanded the boat that captured the Egyptian destroyer Ibrahim el Awal, which was renamed the IDF ship, INS Haifa.