Keith’s review published on Letterboxd :
A fairly low-budget horror film, with Franka Potente in the lead role as the only one that most people will have heard of. Initially I was cautious about watching this film, having seen plenty of sub-par low (or no) budget horror flicks, however this has some things to offer.
Firstly, Potente delivers, like she usually does. Secondly, the location of the film is quite interesting as pretty much anyone who has ever been to London has used the underground.
The film itself is divided fairly neatly into two halves, with the emphasis on the first half being quite different than the second half. In the interest of not spoiling the film, I won't go into more detail. I must say I preferred the first half personally, but the second half is in no way less than the first.