The Task Force soldiers Ghost and Soap were traveling in Yemen.

As they walk through a small forest they see something shiny, a bracelet made of silver.

Soap picks it up and cleans it, Ghost takes it in his hands and reads a Latin saying "Attenrobendum eos, ad constringendum, ad ligandum eos, pariter et solvendum, et ad congregandum eos coram me." Nothing happens but soap looks behind ghost in horror

A kind of portal has formed from which you come out.