The Queen is being asked to try to help stop the wreck of a sunken Peterhead fishing boat being "desecrated" by a survey.
The Queen is being written to by some Trident widows
Authorities want to establish why the Trident sank in 1974 off Caithness with the loss of seven crew.
However, relatives of those who died are opposed to the investigative survey which would cut into the wreck.
They have already petitioned Tony Blair and are now writing to the Queen to ask her to intervene to stop the work.
A diving vessel paid for by the Department for Transport is due to start its underwater survey this week.
Several of the families believe cutting into the vessel may destroy vital evidence and destroy the remains of their loved ones.
Their alternative plan is to raise the wreck and recover the remains of the crew for burial.
Several of the widows earlier travelled to Downing Street and appealed directly to the prime minister to halt plans to cut the wreck open.
Jeannie Ritchie, 65, who lost her husband and father, told BBC Scotland: "By doing so, they will lose all the vital evidence on how the Trident sank and it would desecrate the men's graves.
"The Queen is the head of the state so we're going to write and plead to her.
"This survey cannot be allowed."
The wreck of the Trident was discovered by amateur divers five years ago, leading to an inquiry being restarted.