He said empty beaches are sometimes empty because of dangerous swimming conditions.
"It's about getting that local knowledge as well when you're travelling around on holiday this summer going to different places, when you might not necessarily be familiar with the conditions, it's really important that people read signage and get that local knowledge [so] they know what the risks are."
Christie said swimmers should watch for rips, be wary of unpatrolled coastlines and check the forecast.
He said swimmers should know their limits, be aware of the dangers, and keep track of the other people they are swimming with.