Round the Moon by Jules Verne

The very spot where the projectile had disappeared under the waves was exactly known. The instruments for seizing it and bringing it to the surface of the ocean were still wanting. They had to be invented and then manufactured. American engineers could not be embarrassed by such a trifle. The grappling-irons once established and steam helping, they were assured of raising the projectile, notwithstanding its weight, which diminished the density of the liquid amidst which it was plunged.

But it was not enough to fish up the bullet. It was necessary to act promptly in the interest of the travellers. No one doubted that they were still living.