WesWorld

A fair enough assumption...

[SIZE=3]Pooka-class Coastal Submarine[/SIZE]
Date: 1939
Coastal
Armament 1x3" gun
ElecHP: 900hp
DieselHP: 2800hp
CREW: 36
wt fuel&batts: 190t
Light Displacement 466t
Loaded Displacement 561t
Full Displacement 706t
Reserve buoyancy: 21%
Max Surf Speed: 17.7 knots
Max Sub Speed: 8.3 knots

Length: 62.0m
Beam: 4.9m
Draft: 4.7m
Crush depth: 200m
#TT 4 x 533mm (4 bow, 8 reloads)
Tons Oil: 95.0t
Tons Battery: 95.0t
Cruise speed: 12 knots
Submerged speed: 6 knots

Surface Range: 6515nm@12 knots
Submerged Range: 40nm@6 knots