<prompt> Translate the following text to EnglishIkiwa hujawahi kupiga mbizi kabla, kila kituo cha kupiga mbizi kimeandikishwa na serikali ya Ugiriki kutoa mafunzo pamoja na usimamizi wa kupiga mbizi kwa wapiga mbizi waliohitimu.  <response>: If you have never scuba-dived before, each dive center is registered by the Greek government to offer training in addition to dive supervision for qualified divers. 