The climax of the Aseres Yemei Teshuva and Yom Kippur is the final tefillah of Neilah, in which we beg an beseech Hashem to forgive us and bless us and our families with a happy, healthy and prosperous new year. This special tefillah is lead by the Rebbe who sheds copious tears throughout as he davens for all of Klal Yisroel.
Towards the end of Neilah thousand of Yidden will scream out together “Shema Yisrael… Hashem Echad” as the accept upon themselves Ol Malchus Shamayim (the yoke of heaven). Then the Rebbe blows the shofar signaling the end of the fast.