See screenshots. If you place down a rail, a tnt on top of the rail and a normal minecart onto the rail, you can see caves by entering the minecart.
MC-23041
See caves because of minecart under TNT
Resolved
Duplicate
0
nipser
(Unassigned)
Unconfirmed
minecart, tnt, x-ray
Minecraft 1.5.2, Minecraft 1.6.1
Retrieved
Duplicate of MC-1769, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being closed as duplicate.