(UPDATE: The buster power has been lowered to a considerable level, and also replaced useless BRAY shield to LIGH strike. Added pictures (deco off for visible mechanism) for stages.)

A powerful bomb with a unique ability of busting a hole into the target! (Thanks to CRAY. As said before in greymatter's contest (where it has been rejected due to deleting CRAY), it can be adjusted to dig only fair amounts through console). It is less than 300 pixels and can already cause massive destruction! It is guranteed to not leave any remains after the explosion. This bomb is 3-staged. Each gradually increasing in time and power, from instant to several minutes.

This bomb won circovik's bomb contest (where its "less than 300 pixels" feature was designed following the rules) and was meant only as an entry. Although after trying it on other bunkers (usually the popular ones like Vault Tec. Vault 1) and realized there was more power to it than I thought as it destroyed it directly (unlike other bombs, which based on destroying it from the outside) and so I tried to make this a bomb for use against other targets.

1. The buster stage.

It busts a hole into the target. The construct of this stage is removed right after it drills a hole. Do not worry, the rest of the bomb is not damaged.

2. Main explosion.

Hydrogen fusion occurs along with a neutron blast. Most of the bomb is already removed. (Beware, the bomb uncommonly releases the 3rd stage earlier than expected.)

3. Last explosion.

A mercury blast simulating the effect of (exaggerated) radiation destroys the remaining landscape. It takes really long to end this stage, which compares to real radiation which renders an area unhabitable for a very long time. This part is easily vulnerable to electricity forming a so called electric storm:

which delays the end of this stage even further. 

The deco is based on the bomb in the 4th (or 5th) image when you search "Grand Slam bunker buster" in Google Images.

TheEditor:

AWESOME! You won a bomb contest wtih that

 Yeah, I forgot adding the details about the bomb contest in the original version of this thread. Good thing I added it now!

greymatter:

@PTuniverse (View Post)
I especially liked the mercury flood. The deleting cray is it's only drawback. Perhaps create a version without the cray(so only stages 2 & 3)?

 But then it wouldn't be a bunker buster. It would just be like the ordinary DEUT-Fusion-LIGH bombs in circovik's bomb contest. Then again, The CRAY blast can be deduced to a fair level.

...Eh?