With tensions continuing to heat up on the maritime border between North and South Korea a limited North Korean provocation of some sort is becoming more likely and in response the South Korean government has just

The British Telegraph yesterday said that South Korea is going to buy the laser-guided GBU-28 “bunker buster” bombs from the US. The 5,000 pound (2,268 kg) bomb nicknamed “deep throat” was originally developed by Texas Instruments Defense Systems division now part of Raytheon Company.
The GBU-28 was used during Operation Desert Storm in 1990 to penetrate underground command centers in Iraq.
The bomb could be used to target North Korea’s intricate system of military bunkers and a series of munitions tunnels along the border, the Telegraph said.

An unnamed South Korean military official told the Yonhap news agency that the bombs would be delivered between 2010 and 2014.   [Defence Professionals]

These bombs start being delivered next year, which means that they can’t be used in any provocations happening in the short term, but I do think it sends a signal to North Korea that South Korea means business in regards to its maritime border and is willing to purchase the weaponry necessary to protect it.