New York City’s Metropolitan Transportation Authority (MTA) has announced great progress in its “East Side Access” project. In less than a year – two tunnel boring machines have dug tunnels of 5,421 feet and 3,705 feet. The longer tunnel is over a mile long – and by public-works standards, that seems pretty fast. Worth remembering [...]
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.