The safe is floating on a raft in the moat around Caerphilly Castle. To open it and claim £5000 the teams must build harpoon boats that can race around the moat, shooting at and collecting targets that hold the numbers to open the safe. It’s a battle between science and history – compressed gas harpoon and a crossbow – But which weapon is more accurate and whose boat will survive the shallow moat?
Over two days, and with a limited budget and materials, two teams attempt to build a vehicle which will help them travel to a safe in a seemingly inaccessible location. On the third day, the teams race their vehicles towards the safe. The teams pick up the safe’s combination, with the first team to arrive entering the combination, and taking home the contents of the safe – £5,000 in cash!
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