Admission of goods into special economic zones requires Unit entry, conditional general permissions, and safeguarded hazardous admissions. Admission of goods into a Special Economic Zone covers goods imported or procured from the Domestic Tariff Area for authorized operations, which must be brought into the Unit premises; goods needing frequent entry and exit but not used in authorized operations may enter or leave on general permission with reasons recorded by the Specified Officer; hazardous goods are admitted only into specially designated areas or installations and subject to safeguards specified by the Specified Officer.