Expires 4 months after purchase. May be repurchased every 60 days. Limit 5 per 6 people, may buy 5 additional as gifts. Booking required at least 24 in advance by phone 0330 1222205. 24-hour cancellation policy. Present printed Groupon on arrival. £10 surcharge per group for Sat-Sun bookings. Please arrive 15 mins prior to booking for safety briefing. Must be 7 or older. Under 18s must be accompanied by an adult. Cannot be used towards parties. Equipment provided. Not valid in conjunction with any other offer. Based on the highest priced option. Voucher is for Bunker 38 only. Verified using our merchant's website on 18 May 2016.