Abstract: A modular freezer unit comprising a movable portion such as a belt, track, or chain connected to a plurality of wells, each well capable of containing materials to be stored in the freezer is disclosed. The unit further comprises a tracking means such as a bar-code, or radio-frequency identification reader that is capable of reading suitable tags on each container of materials stored in a well. A motor that operates to move selected wells to an access point in response to user input may be integral to the unit, or otherwise connected to the movable portion. The access point can be opened by a user so that the entire freezer does not have to be opened in order for materials to be placed therein or removed. The unit may upload information about its contents to a database so samples from multiple units can be tracked.