The Royal Navy's flagship HMS Bulwark will sail into Weymouth later as the force prepares to provide security for the sailing events at the Olympic Games.
Patrol vessels, landing craft, the Royal Marines and Merlin Helicopters will patrol the coast of Dorset during the games.
More top news
Sunny this evening, then dry overnight. There is the risk of thundery showers for Kent tomorrow morning, then sunny spells by the afternoon
Sunshine to end the day then dry tonight. Tomorrow will be mostly dry and feeling fresher with the risk of a heavy shower in the afternoon
The video, obtained by ITV News, shows scores of migrants desperately trying to board lorries in a restricted area within the tunnel.