A close detail of the Polish Navy destroyer Blyskawica (1936) moored on Greenwich Tier, River Thames, London. The photographer is on the conning tower of the submarine Sep (1938) looking forward and to starboard showing the midship 37 mm gun mount, the funnel, the motor cutter, the foremast and the forward superstructure of the Blyskawica (1936). The top of the foremast is out of the picture. The bow of the Sep (1938) can be seen on the left and the Royal Naval College buildings are in the background