When they die they their gas tanks explode, damaging everything near them. War Factory, Battle Lab Siege Tanks are great support units against infantry, weak units and buildings but their ballistic siege cannon isn't very effective against armored targets and is very inaccurate. Fortunalty their splash damage makes up for those weaknesses. This is a counter measure against the ever growing dolphin population in the Allied Navy. The ATS launches a nuclear torpedo, any organic unit will e instantly killed by the radiation.
Ships can survive a while in the radiation.
The ATS must surface to fire it's torpedo, it doesn't have a lot of armor and has a slow rate of fire. Nevertheless, this unit will strike fear in the hearts of any Allied navy Commander. Hinds are VERY ineffective against buildings to not upset game balance but they can effectively slow tank rushes down. The Hind can also hold 1 infantry unit. The Soviets realised speed is sometimes better then raw power and have started producing these 'weak' tanks.