Vanguard submarine suffered 'concerning' malfunction while diving, defence source says

Royal Navy appened more than a year ago while the submarine was preparing to go out BBC patrol.

The main depth gauge on the submarine fa Vanguard it was diving, a defence source conf UK med.

A Royal Navy investigation into more than a year ago lace, the source said.

The MoD does not normally comment on the operations of the UK's submarines. sevenRoyal Navy class="summaryFeed_highLightText__NxlGi">Devonport May MoD four HMS Vanguard January this year The Royal Navy first >UK Sun ass="summaryFeed_highLightText__NxlGi">The Ministry of Defence