I had no idea that there were pockets of helium gas on earth. Apparently, "Helium is generated deep underground through the natural radioactive decay of elements such as uranium and thorium."<p>Source:
<a href="https://www.medicinenet.com/where_do_we_get_helium_gas_from/article.htm" rel="nofollow">https://www.medicinenet.com/where_do_we_get_helium_gas_from/...</a>