Improvised UNSC bomb

The Crow's Nest Bomb is a bomb of unknown type that was used to destroy the UNSC base Crow's Nest. Little is known about the bomb, other than the fact that it has a large blast radius.

Battle of the Crow's Nest

THAT DOES BOMBOM

Trivia

• The large bomb appears to have smaller charges mounted on its main body casing. It is connected to many smaller bombs throughout Crow's Nest, destroying most of Crow's Nest, except the basement and the motor pool.
• It appears that these bombs can also be found on the level Sierra 117. After the cutscene where Johnson is thrown into the small porch, jump down off the cliff and turn behind (once enemies have been eliminated, or in Theater) towards the gate. Stored within the gate are two more bombs, most probably duds.
• The large bomb appears to be non-nuclear. It is likely a thermobaric weapon, which is commonly used to take out enemies in caves or tunnels. Thermobaric bombs generate a lot of air pressure as the result of a fireball effect, which comes from the dispersion of a compound like aluminum oxide or iron oxide. This effect generates a fuel air mixture, and it removes most of the oxygen from the tunnels or caves, causing lungs to collapse.
• It appears to be the UNSC equivalent of the Covenant Bomb that was found on Cairo Station in Halo 2.
• It has been a joke at Bungie about how Miranda, in the original Halo 2 script, was supposed to "weld a thermobaric bomb to the Master Chief's armor" in a deal with the Prophet of Regret. Jason Jones, on the Halo 3:LE commentary, said he wanted to put this in Halo 2, and was going to add this to Halo 3. This bomb may be a reference to it, as Miranda is in charge, and the Chief has to arm it.
• Its description is very similar to the NOVA bomb in Halo: First Strike, indicating it may be the very same, or a smaller version. Of course, to suggest that the Crow's Nest Bomb is, in fact, a NOVA bomb would be quite absurd: the NOVA bomb used in Halo: Ghosts of Onyx (and presumably any other NOVA bomb) is a large cluster of smaller nuclear bombs powerful enough to obliterate an entire Covenant fleet as well as a nearby moon. To detonate a similar device inside Crow's Nest - or anywhere on Earth, for that matter - would be tantamount to suicide.