Install:
1. Use OpenIV and navigate to -

Grand Theft Auto V\x64g.rpf\levels\gta5\generic\cutsobjects.rpf\

- Enable edit mode!

2. Drag and drop both files( p_michael_scuba_tank_s.ydr  &   p_s_scuba_tank_s.ydr ) into OpenIV.

 - Close openIV and run game!