* “Ascends” - from the sea, since they are fished with nets:
Talmud Shabbat 74b – Hunters of shellfish knot and unknot.
Rashi’s Commentary - Hunters of shellfish, in order to dye the tekhelet with its blood.
Knot and unknot; since all nets are made of multiple knottings … and sometimes cords need to be taken from one net and added to another, unknotting from one and knotting to the other.
** “Once in seventy years” - once in a blue moon
Mishna Makkot 1:10 – A Supreme Court [Sanhedrin] that metes out capital punishment once in seven years is called destructive. Rabbi Elazar son of Azarya says: once in seventy years.
