Sinking Ship Mind Challenge

Riddle: On a fine sunny day a ship was in the harbor. All of a sudden the ship began to sink. There was no storm and nothing wrong with the ship yet it sank right in front of the spectators eyes. What caused the ship to sink?

Answer: It was a Submarine.

Source: https://www.riddles.com/319

On a fine sunny day a ship was in the harbor. All of a sudden the ship began to sink. There was no storm and nothing wrong with the ship yet it sank right in front of the spectators eyes. What caused the ship to sink? — Sinking Ship Mind Challenge by Anonymous v1.

Riddle: On a fine sunny day a ship was in the harbor. All of a sudden the ship began to sink. There was no storm and nothing wrong with the ship yet it sank right in front of the spectators eyes. What caused the ship to sink? Answer: It was a Submarine. — by Anonymous v2.