After a Disruptor Blaster turned 7/10 of my squad to dust, my three remaining aquanauts (Victor, Helga and Ulrich) went on a rampage. Using captured grenades/disruptors, they've blasted upper level of the colony and generally made such pandemonium, that even the aliens started panicking from the Hell that was set loose.
Sadly, Victor, the main Disruptor launcher operator, then perished to that damned Tentaculat that was hiding in the corner. The other two dealt explosive punishment to the tentaculat.
Helga and Ulrich then descended deep into the alien base. Sneaking through rooms nad using less populated areas, they blew up several Lobstermen with grenades. They had one grenade left, a Plasma Rifle with two shots left, and a fully loaded Gauss Pistol.
They decided to leave the grenade for Symmonium Device in case they find it. They were sneaking around and almost got there, when suddenly Helga was accosted by a zombie - Ulrich got Tentaculat'd! Helga, in a rage, killed the Zombie with gauss pistol, killed emerging Tentaculat with gauss pistol, then let the other Tentaculat zombify her.
BEEP-BEEP-BEEP, went the primed Sonic Grenade before sound-liquidifing the room (and the Tentaculat) to mush.
X-com: Terror from the Deep