Split cubs up into small groups. one group to send message via morse code and confirm by walkie talkie
Walkie Talkies, Morse code generator or walkie talkie with Morse generator
Split cubs up into small groups. Put them in separate rooms, group 1 to take turns to tap out a word in Morse code to form a sentence. Group 2 to decipher message. Once they have the sentence they call group 1 on walkie talkies and tell them the sentence. They then swap over.