Original sentence: It was discovered that her auxiliary machinery was on rubber mountings, to quieten the boat by reducing sound transmission into the hull.. Also, during the early part of the war, Royal Navy depth charges could not be set to detonate deeper than  - U-boats were thought to have a maximum depth of.Marriott would later command HMS Graph...On the 3rd of October, she reached the UK, manned by a Royal Navy prize crew, under the command of Lieutenant George Colvin, previously the commander of HMS Sunfish, with Lieutenant Peter Marriott as his second in command
Edited sentence: Also, during the early part of the war, Royal Navy depth charges could not be set to detonate deeper than  - U-boats were thought to have a maximum depth of.It was discovered that her auxiliary machinery was on rubber mountings, to quieten the boat by reducing sound transmission into the hull.Marriott would later command HMS Graph.On 3 October, she reached the UK, manned by a Royal Navy prize crew, under the command of Lieutenant George Colvin, previously the commander of HMS Sunfish, with Lieutenant Peter Marriott as his second in command