From Destinypedia, the Destiny wiki
Restricted is the entrance to the long buried Deep Stone Crypt as well as a security checkpoint that guards the contents within. During the Raid on the facility, the Guardians tracked the Salvation remnants to the facility here and breached the overridden security mechanism within, delving deeper and deeper into the heart of the Crypt. It is also here where the Morning Star Space Station crashes down and where the surviving Guardians face off against the newly resurrected member of the House of Salvation, Taniks, the Abomination.
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