An amazing experience and well worth the money ( i actually think it was worth more than the £10 i paid). Simone was an excellent guide and kept the tour group fully engaged with a very lively, and fact filled 1 hour. He explained the History behind the tunnels and how they had been used in the war. As a WW2 buff i hadn't heard of this before so it made it even more interesting. You do have to be reasonably agile, as some of the tunnels are quite tight in both width and height, but there are alternatives which Simone explained, and allowed people to miss out some parts if required. If you like this sort of thing get booking as you will not be disappointed !. As a Volunteer myself in the UK on two different WW2 areas i appreciate all the hard work these guys and girls have been putting in to making these tours possible. If i come to Naples again i will be booking again, as 1 hour passed so quickly - Well done Napoli Sotterranea