Fishing Trawlers Minesweeping during WW2

Converted Fishing Trawlers Minesweeping during WW2.
Narrated by Roland A Smith, this section features the recruitment of fishermen as volunteers into the Royal Naval Patrol Service. Film footage also shows the methods of sweeping enemy mines plus scenes at HMS Europa, Lowestoft, Grimsby docks and minesweeping off the southern coast of England.

[@Pitcairn2]

My Dad is in that crowd somewhere possibly-Skipper Lieutenant 1944-47

[@bl7355]

My great grandfather was there, a fisherman who had been a RN diver before the war and who had fought in the trenches during WW1.
Please can somebody tell me what the march they are singing is?

[@HydroSnips]

It’s “Sons of the Sea (Men of the Ocean)”, I think.

[@callumwhite2116]

What are they singing when they are marching?

[@HydroSnips]

I think it’s “Sons of the Sea (Men of the Ocean)”. There’s lots of versions of the song but think this is a WW1 version, the first line is different but they’re singing the chorus (just ignore first line, the rest fit):
“Sons of the Sea, all British born
1:45 Sailing every ocean, laughing foes to scorn
They may build their ships, my lads
And think they know the game
1:59 But they can't [build] boys of the bulldog breed
Who made old England's name.

[@callumwhite2116]

@@HydroSnips Thank you