How to save your base if you see wild Giga near.

Grab bow or any range weapon and make it folow you in sea. Go as far as you can in water. Its only way. Dont even think trying to kill this expetialy if you are solo it wont work. You will probably break your shotgun before it dies few times over. And in meantime he will destroy all your tames and whole base. So make it folow you in sea as far as possible. Ideal if you can lure it out of your base render range. And good luck if you see this thing near your base. You will need it.