Walternate

I see, thanks everyone . Just long enough to drown and die (5-10minutes).

Ok i'm writing a novel where my character tries to commits suicide by drowning himself. He ties his feet together, attaches weights to his ankles, tapes the rope so he can't untie himself and then jumps into the sea. I need to know how much weight will my character need in order to successfully drown himself and stay at the bottom even if he struggles. He is using metal barbell plates. How much weight will he need? Will 15kg (33lbs) be enough to keep him at the bottom? My character weighs 70kg (154lbs), he is 6 feet tall and not physically strong or good swimmer at all. (He couldn't carry the 15kg weights with his hands but used a backpack). The sea where he jumps is 30 feet deep. I want to make it as realistic as possible. thanks.