Have sailed from Lorient down to Australia then east from New Zealand and re emerged in the Pacific on the left side of map and sailed round S America back to Lorient
With unlimited fuel of course and took forever to do
Twas in stock SH3 so bugger all in the Indian Ocean of any note then and no Panama canal either

Yeah, I remember doing that to....had to carry my boat across land and set sail again in the Caribbean http://imgcash6.imageshack.us/img524...aryheadsw0.gif

It is possible to do it without refulling in a IXD2, long as you stay at a steady 7-8 knots and don't wander too much chasing down merchants. If you manage to run into a tanker convoy coming from the Carribean you can always refuel in Penang if you want to complete the circumnavigation thing. Too bad you don't get anything out of it other than getting chewed out for being out on patrol for 6 months.