The murky waters of the Johor Strait, just off the Sembawang Camp jetty, would not rate high on any list of dive destinations.
Sandwiched between the coasts of Singapore and Malaysia, the channel is muddied by the silt of land reclamation projects and the contents of over a dozen rivers which empty into it.
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A version of this article appeared in the print edition of The Straits Times on September 17, 2018, with the headline Under the sea: Naval combat divers show what's it like beneath our waves. Subscribe