Cripes, anti-Hammer submarines. Is scary thought. You can launch missiles off those things too, of course – that’s existing technology, in fact!
Also, I remember how the Traveller “meson guns” worked: Mesons are exotic particles that don’t interact with matter, but also have a very short lifespan before they decay into (deadly) radiation; by accelerating them to near-light-speed, and calculating precisely how much those relativistic velocities slow down time in the mesons’ frame of reference, you can determine exactly when and where they decay.
Now, trying to burn up the Q-beam is, wow, expensive:
Q-Beam
Resources Obstacle: 12 points
Enhanced Range: Artillery-plus (+10 pts)
(This is extrapolating from Vehicular range costing 8 points and Artillery costing 9)
Indirect (+8 pts)
Megablast (+6 pts)
Categorical Limitations x 3: cannot fire into atmosphere or dust clouds – restricts Direct Fire, Suppressive Fire, and shot opportunities (-3 pts)
Mounted (-3 pts)
Categorical Limitation: must be mounted on a fortress or a vehicle with Integrity of 8 or more (-1 point)
(Again, extrapolating from Vehicular weapons requiring Integrity 6 and Artillery weapons requiring Integrity 7)
Inaccurate: +1 Ob to Direct Fire, Suppressive Fire, and shot opportunities (-4 pts)
Categorical Limitation: may not be used in Close Combat at all (-1 pt)
And all that is after you’ve already bought an Artillery scale weapon (Ob 8) or a vehicle with artillery mountings (like a SPAG or Hammer warship) as the base to upgrade from.