Nami explosive gel

Demo images, not finals

ending 2, Natalyia pours a barrel of explosive gel into Nami's stomach, when the contents of the gel are rapidly moved, the gel expands (not enough to pop the victim whose full of it) and will detonate in 5 seconds. Natalyia has evacuated fom the deadly bomb in the belly of nami.
(the gel is super light at first, but after it expands and arms into bomb form- the gel grows heavier than concrete. it doesnt continue expanding)