I understand that this is a low light environment, hence requires a longer shutter time. However, for a 'long exposure' challenge, I'dd expect the long exposure to add something to the pic.
Apart from that, I think the pic is still pretty dark and there is nothing much to see on it. A wider view might have worked better here.
this has been an interesting challenge so far, i think alot of these entries have taken, not the blurred movement approach, but the play of light approach. i really enjoy this shot from a archaeological point of view /8