The scope of this HIR is to specify general oceanographic environments. Specific environmental requirements shall be specified in a detail specification. Specific requirements are in the state of constant flux because the ocean environment is constantly changing and the changes occur not only on a seasonal basis but also monthly@ weekly@ daily@ and in some cases even hourly. This HIR is to be used as a guide only. PURPOSE It is intended that this Hydrospace Information Report (HIR) set down general environmental requirements for the design@ development@ evaluation and testing of submarines and deep submersible vehicles. This document sets forth the environmental limits within which submarines and deep submersible vehicles@ related components@and associated equipment should operate satisfactorily and reliably. The detailed performance and test requirements for a particulars submarine or deep submersible vehicles@ related components@ and associatedequipment shall be as defined in the detailed specification.