"Due to a build up of condensation you may be dripped upon during this evening's performance. This is entirely harmless", reads a sign inside the Old Vic Tunnels.
The Old Vic Tunnels is a performance space located deep under the ground, below Waterloo train station. It was, so the story goes, the Old Vic's artistic director Kevin Spacey, together with producer Hamish Jenkinson, who happened upon the old network of tunnels a couple of years back.
Up to that point, the tunnels, once used by the now defunct British Rail, had lain unused and in the dark for more than 20 years.
The pair immediately realised the place had remarkable qualities and, given a bit of a clean up (but not too much of one), would make for a very special arts venue.
Looking at the nondescript entrance, you could never imagine what lies beyond. The dimly lit, mysterious, atmospheric space is the perfect setting for a range of performances, installations and productions.
Banksy's debut movie, Exit Through The Gift Shop, premiered here at the Old Vic Tunnels.
The capital's largest community production, Platform, was also held here to sell-out audiences. The week-long run comprised more than a hundred volunteers, aged between 16 and 76.
Speaking of volunteers, the Old Vic Tunnels is always on the lookout for people to help out in a range of roles.
Volunteer positions could involve selling programmes, working at the Bunker Bar, or simply helping people find their way about the place.
Though no financial remuneration is given, the organisers like to offer something in return for your time. It might be some Krispy Kreme doughnuts, or possibly a branded hoodie. You'll also have the chance, should you wish, to audition for productions taking place at the venue.
Doughnut or no doughnut, the best reward will be the invaluable experience and knowledge you gain from helping out in a cool arts venue, meeting people in the business and hopefully seeing a few shows for next to nothing. Oh, and they'll also throw in a fiver towards your travel expenses on the nights that you volunteer, which is a nice touch.
Some past volunteers have gone on to great things: writing scripts, working backstage, helping in the marketing department, designing websites etc. If it's enough for you to just sell programmes, that's fine too, but if you're the ambitious type, the possibilities are endless.
The Old Vic Tunnels also run an internship programme. These require you to commit to three days a week for three months, and are an incredible opportunity for young people who are interested in working in the field of arts and entertainment. Click here for more information regarding internships at the Old Vic Tunnels.
If you fancy experiencing a show in one of London's coolest arts venues, click here to find out what's coming up.
You might also be interested to know that every ticket sale made for an Old Vic Tunnels event includes a donation to the Railway Children charity, an organisation that endeavours to help vulnerable children around the world who live on the streets or face other similar hardships.