Hunting HMS Nelson - and I can't get near enough

[Achtung Englander]

This is sooo frustrating

Its May 1940 off the west coast of Ireland with orders to patrol near Gibraltor. Having chugged all around Scotland and west of Ireland from Wilhaesvan (sic) I encountered a convoy protected by 4 destroyers including the huge Nelson.

This was during daylight 2pm.

I managed to sink the 3 lighter destroyers but now I am stuck. I am 3.5km away from Nelson and he is doing 6 knots and zigzagging like there is no tomorrow.

When I surface he uses his big guns and I am forced to dive - yet at top speed dived I can only 6 knots. I cannot catch up.

Firing my torps is hit or miss literally due to his zigzagging.

I even tried to outpace by mapping direction of convoy but the minute a convoy boat spots me they steam away.....

I really want to sink her. Any suggestions ?