An oceanographic research sphere consists of a rigid outer shell of mass \(3.0 \text{ kg}\) and outer volume \(0.012 \text{ m}^3\), containing an internal instrument package of mass \(5.0 \text{ kg}\). The sealed sphere is held completely submerged at rest in fresh water of density \(\rho = 1.0 \times 10^3 \text{ kg/m}^3\) and then released. Assuming water resistance is negligible at the instant of release and using \(g = 9.8 \text{ m/s}^2\), what is the magnitude of the initial acceleration of the sphere?