![](https://www.historynet.com/wp-content/uploads/2022/09/UDT-Swimmer-Operations-at-Balikpapan-scaled.jpg)
An underwater demolition swimmer checks his swim fins and face mask, during UDT operations at Balikpapan, July 1945. (Naval History and Heritage Command)
An underwater demolition swimmer checks his swim fins and face mask, during UDT operations at Balikpapan, July 1945. (Naval History and Heritage Command)