void OnMouseReleased(Vector3 dropPosition)
{
dropPosition.z = 0.0f;
AudioManager.singleton.PlaySfx(massHit);
GameObject holeSpawned = Instantiate(holePrefab, dropPosition, Quaternion.identity);
bilge.AddHole(holeSpawned);
Hole h = holeSpawned.GetComponent <Hole> ();
h.bilge = bilge;
h.OnCreateHole();
}