Concerns about the Walney Channel proved justified ; the launch was delayed by half an hour due to a protest by the Campaign for Nuclear Disarmament , leaving insufficient clearance in the Channel .
The boat became stuck in the mud .
Concerns about the Walney Channel proved justified ; the launch was delayed by half an hour due to a protest by the Campaign for Nuclear Disarmament , leaving insufficient clearance in the Channel , and the boat became stuck in the mud .