Takes Melta charges

If the explosive was enough and it broke through the dome to the magma chamber, it would be worth their lives for the time it might gain the rest of the Legion. But if the charge was not enough and another was needed, to die now, Numeron thought, would be the true futility.
'They're attacking the charge!' Caelius warned.
The five Space Marines were less than halfway up the bowl of the depression. Let this be enough, Numeron thought.'Detonate!'  he commanded, and he embraced the desperation of the moment.' Do it now!'
The world erupted.
...
The explosion hurled Numeron up, through Ork bodies, towards the cavern wall. For a few seconds his auto-senses were as disrupted as his own thoughts were from the concussion.
'Squad, call out,' he shouted, as much to clear his head as to know who was alive. He rose to his feet, still blind, as the other four responded



Vulkan: Lord of Drakes pg. 95,96 and 107.