The three dots have spaces between them. A single in Morse Code dot is the letter "E". In amature radio, the "E" is pronounced "Echo" to avoid miss interpretation with other letters such as "B"(Bravo), "D"(Delta), "P"(Papa), "T"(Tango), etc.
So what if the 'hint' is "Echo Echo Echo"? We plate in a cave, or canyon where we can not see the robot at all times from the drivers' stations. Alternatively, we are repeating a game from years ago.
Just wanted to put forth another tangent.
