Before revision: Technology 250px|A Pachycara similar to the one retrieved by the PERISCOPThe PERISCOP differs from previous pressurized recovery devices in that it contains separate chambers – one for capture, one for recovery under exterior pressure, and one for transfer to the laboratory while maintaining pressure.
After revision: Technology 250px|A Pachycara similar to the one retrieved by the PERISCOPThe PERISCOP is unique in pressurized recovery devices and contains three chambers – one for capture, one for recovery under exterior pressure, and one for transfer to the laboratory while maintaining pressure.