Korea's Kim Sung Eun and Yoo Na Mi perform in the duet technical routine preliminary round in synchronized swimming, in the Olympic Aquatic Center at the 2004 Olympic Games in Athens, Tuesday Aug. 24, 2004. (AP Photo/Lefteris Pitarakis)
Synchronized swimming explained
From unflavored gelatin to underwater speakers to "beeping;" synchronized swimming has a specialized set of equipment and competitive framework all its own. -- By John Parker.