Yisroel and Torah is analogous to fish and the sea. Just as the existence of the fish is dependent on the sea, so too the existence of Yisroel is dependent on the Torah.
Furthermore, according to that which the Rebbe Rashab whose Neshomoh is in Eden explained in his Maamorim. The opinion of Rabbon Shimon ben Gamliel is that fish are not a Chatzizah for Mikvah immersion.
Dependent on Torah: As we say in Maariv כִי הֵּם חַיֵּינוּ וְּאוֹרֶךְ יָמֵּינוּ “For the Torah is our life and the length of our days” this is based on the Possuk in Devorim 30:20
Rebbe Rashab: Rabbi Sholom Dovber Schneersohn 1860-1920, the fifth Lubavitch Rebbe second son of Rebe Maharash. He is also known as "the Rebbe Nishmosei Eiden. His teachings represent the emergence of an emphasis on outreach that later Chabad Rebbes developed into a major theme. He established the first Chabad yeshiva, Tomchei Temimim. Known informally as "Rambam of Chabad Chassidus" (from his encyclopaedic work on developing Chabad Chassidic philosophy into an organized system), Rebbe Rashab was a prolific writer on Chabad theology. Much of his work has been published in Hebrew, and some of it has been translated into English, and is available online. Sefer HaMaamorim - Igros Kodesh - Toras Sholom - Kuntres Uma'ayan - Kuntres HaTefillah - Kuntres HoAvodah - Maamar Heichaltzu - Kuntres Eitz HaChayim - Chanoch Lana'ar.
Fish are not a Chatzizah: If someone was to immerse in a body of water that had fish and there would be a fish on the person obstructing the water from touching the skin this would still be considered as a kosher Tevilah considering that the fish are one with the water. This would not be the case if it was an insect that was obstructing the water from touching the skin.
Because the whole existence of the fish is from the water, therefore fish are not a Chatzizah because they are as one entity with the sea. And so it is too the relationship between Yisroel and the Torah that they are one entity.
