Trident 24
Well-Known Member
Back in the day
In caving circles, before SRT became popular communicating over the noise of a waterfall was fairly important....especially if you were in the waterfall.
We used a simple mnemonic: SUD (Stop, Up, Down)
It didn't matter if you used a whistle, shouts or flashes of light...1 was stop, 2 was up & 3 was down.
In caving circles, before SRT became popular communicating over the noise of a waterfall was fairly important....especially if you were in the waterfall.
We used a simple mnemonic: SUD (Stop, Up, Down)
It didn't matter if you used a whistle, shouts or flashes of light...1 was stop, 2 was up & 3 was down.