After underground blowouts, shallow gas blowouts are the second most common type of blowout and the most common type of surface blowout. The risk of cratering is a major threat for bottom supported units. As it is impossible to eliminate them (most shallow gas-prone areas are developed from bottom supported units) emphasis should be put on careful planning and tight monitoring during execution. Loss of rig, platform and life have resulted from shallow gas blowouts. Invariably, the well is lost Preparing for shallow gas can save lives and rigs. This module looks at modern day diverters the dangers of shallow gas, precautions and procedures for shallow gas drilling, The diverter assembly is either hydraulically locked or locked with right hand “J” which positively aligns the the outlets of the diverter with the outlets in the support housing