Data Hive

Data Hive is a Halo 3: ODST level. The characters, objectives and enemies are currently unknown, the only known thing is the Data Hive achievement, which is unlocked after you complete the level and therefore unlock the Chasm Ten in firefight mode. There is also an achievement called I Like Fire which requires you to score 10 kills with the Flamethrower on this level in order to be unlocked.

The term "hive" has been used before to reference the Flood in previous Halo games, perhaps hinting they may make an appearance in ODST. The fact that a fire-based achievement is in this particular level also seems quite coincidental, given the known fact that the Flood is highly susceptible to the flamethrower or fire-bomb grenade.