• Fixed the infinite underwater sound rumble.
• Optimised netcode (should reduce -PLEASE WAIT- time by about 30%).
• Correct version of ThDQ.u included, so multi-floor sketch maps work online.
• Misc. bug fixes.
• Th-Korman:
  • Fixed the skybox HOM problem
• Th-Nostalgia:
  • Fixed the giant gem exploit
  • Added some torches to better balance the map
  • Fixed misc. bugs
• Th-Airship:
  • Fixed an alarm sound crash with dedicated server installs
  • Misc. tweaks

1.6 also includes the fixes from the 1.51 Beta Patch previously posted in our forums:

• No more crashes when retrieving a very long rope arrow (e.g. on Airship).
• No reload delay on the crossbow, instead it simply won't fire if you try to use the crossbow exploit.
• Health is displayed correctly when spectating and no longer covers up the spectator names when the scoreboard is showing.
• Fixed a bunch of crashes on certain servers involving Fragments, Barrels and Carcasses.