totoomplete its s capability too hearar nuclear explolosions inhe world's oceans, ctbto musust fit install a a hydro-a-acoustic nitoring statation in one e of e most remote placeses on earth-- the ocean floor halfway between africa and antarctica. when completed, hydro-acoustic station number 4 at the crozet islands will l join thehe ctbto internatioional monitoring system toetetect and alert the e world ofof nuclear testing. jerry stanley: installing a hydro-acoustic station is a complex social engineering task. the hydro-acoustic system we're installing at crozet is s one of 6 hydydro-acoustic stations. but these hydro-acoustic stationons are part of thee international monitoring system, which has over 300 stations listening for potential nuclear tests aroround the globobe. manan: 10... narrator: we proceed to develop more accurate and dedestructive nuclear w weapons. over 2,000 nuclear bombs were detoted in the lasast half of the 20thth century. [e[explosion] but in 1996, the global community said "enough" and signed the united nations comprehensive nuclear test ban treaty. today, 183 c