<prompt> Translate the following text to EnglishTangu wakati huo, mfumo mkuu wa oksijeni wa MIR umeshindwa mara kwa mara kuwalazimisha wafanyakazi wake kuchoma mishumaa ya kemikali ili waishi, kamanda wake amekuwa na matatizo ya moyo yasiyo ya kawaida na mwanaanga mmoja amegundua kompyuta yake kuu ambayo ni dhaifu kuliko chip katika simu za mkononi.  <response>: Since then, Mirs main oxygen system has failed repeatedly forcing its crew to burn chemical candles to survive, its commander has developed heartbeat irregularities caused by stress, and a cosmonaut has accidentally unplugged its main computer which is less powerful than the chip in some cellular phones. 