madrid spanish rescue service pull three drown men strait gibraltar rescue one man half-sunken rickety boat another open sea emergency service spokeswoman say wednesday men believe boat carry migrants attempt cross europe spokeswoman say one rescue men say six people aboard originally say search continue sixth person condition strait gibraltar narrow strip water connect atlantic ocean mediterranean sea currently dangerous bad weather big wave say tens thousands migrants attempt treacherous cross mediterranean sea africa every year unseaworthy boat lead thousands deaths drown migrant drown top 3,000 mediterranean sea rout fourth straight year international organization migration say tuesday migrants seek good life europe seek new rout spain effort get around european union action curb migration central eastern mediterranean almost 10,300 people arrive spain sea first seven months 2017 iom say september four time many 2016. three dead body pull sea near spain migrant boat sink