Decided to plot out the undersea cables owned by Reis Brandenburg Telegraf und Telefon (better known as BT&T ;D ). The lines in the Rift Valley don't show well but they're there...
One note, I realised as I was working on it that the "maritime boundary" between DKB and NS claimed island groups didn't reflect Nauru (which is Brandenburgian), so I fixed that.
Note 'overseas connections': Dar-es-Salaam to Aden, Dar-es-Salaam to Mozambique, Neue Heligoland to Firanj, Lae to Catanduanes, Neue Königsburg to Sydney, and Nauru to Phoenix (as well as the line from the Fatherland to Ost Afrika passing through Jakarta).
(http://www.swamphen.net/graphics/maps/nav-cbl.gif)
Map edited. The fainter/dashed lines indicate BT&T's desired future plans...
is Socotra still in use?
(I assumed that was handwaviumed away in the 1905 Reboot-Mess, especially with Kuwait no longer a factor.)
Socotra was given back to France iirc.