[Rockin Robbins]

Daytime is for traveling on the surface as fast as fuel economy dictates. Upon plane radar detection I submerge for five minutes, come to radar depth and get back to the surface as quickly as possible in order to cover as much ground as possible. This is especially necessary with Ducimus' evil planes bombing you at periscope depth. If you're hanging out below periscope depth you have no choece but to come up blind into immediate danger such as likely claimed the Wahoo. The surface is not only quicker, it is safer. Maximizing the mileage covered during the day develops the maximum number of contacts. Once a good contact is developed the rest of the day is spent obtaining a good attack position for night.

Night is for dying. The plan is that the evil enemy dies, but this IS war. In the event things go badly for us, night gives us extra cover to do what we have to to survive. Lollygagging around on the surface with no power while you are doing repairs is bad during the daytime. At night, you may live to see the morrow. As the sun sets, I am in position for the night's festivities, making my first approach to the targets. If approach is not possible, I have plenty of time to try something else before daybreak. Under Trigger Maru the escorts have all the advantage. I need darkness to partially even the odds.

So there you go, right out of the playbook "Thunder Below" by Eugene Fluckey. Works well with SH4 and TM.