|Type||Storage / Disposal Facility|
"Making Friends and Influencing People"
The Sandbox is a classified desert location used by the Fury-era S.H.I.E.L.D to quarantine and research hazardous materials, such as the Chitauri helmet recovered by Phillip Coulson's field team in 2013. The team later sends the helmet to the Sandbox, where it's given into the custody of Agent Felix Blake. Coulson mentions having to deal with the Moroccan office of SHIELD in order to get Simmons and Ward fished out of the Atlantic after they jumped out of the Bus en-route from the US to the Sandbox, indicating it is probably located in the Sahara Desert in north-western Africa.