2 player arcade game from 1981 from Sun Electronics. It used a Z80 CPU.
The objective of this side scrolling game (which can be emulated with MAME) is to topple (or rather, sink) a military base in the south pole.
The weapons available to you in this mission are forward firing missiles and
a beam gun (maybe a laser?) that shoots down and forward.
The military base cannot be toppled without extensive use of the beam gun.