Here's a little trick for sneaking into Truk:
Go in surfaced using the channel to the South of the big island, getting in as close to the harbor before sunrise. Time your approach so you can dive at sunrise, take the photos, and then sneak out again. Surface as soon as the DDs are out of visual range, get out again using the South channel, but keep a close watch on your SD radar for patrolling aircraft so you can dive before the see you. I noticed that the Truk ASW planes have an uncanny knack for spotting your sub underwater in good weather!
