semiclosed rebreather
Technical diving equipment that recycles breathing gas, venting a portion on each breath. Used in scuba diving and underwater work.
A semiclosed rebreather is a diving apparatus that reuses part of the exhaled breath.
リブリーザー is the general term for rebreather; 半閉鎖式リブリーザー specifies the semiclosed type, which vents some gas, unlike fully closed systems.
Compound of 半閉鎖式 (semiclosed type) and リブリーザー (rebreather), a loanword from English.