A fishing boat was struck by a cargo ship in thick fog off the coast of Kent on Wednesday morning.
An investigation has been launched after the accident at about 0800 BST which involved the French-registered fishing boat Corona Gloria.
An RNLI lifeboat from Dover helped pump out water leaking from the fishing boat caused by the collision and the vessel was then towed to Boulogne.
The identity of the cargo ship is not being revealed because of the inquiry.
Busy shipping lane
A Dover coastguard spokesman said: "The collision happened in dense fog and there will be an investigation therefore we cannot say what happened.
"The fishing boat sustained some damage and is taking on water but is being towed to Boulogne where it will be met by the Boulogne lifeboat.
"No-one was injured as far as we know."
The collision happened near the Dover Strait - a busy shipping lane.