TM 1.3 crush depth

[DreadWing]

I was taking my new Balao out to sea trials and went to the deep diving test. I Pressed 'D' and went down until the gauge read 558 feet and then the sub wouldn't go down any further no matter what I try to do.

How do I complete my mission if I haven't reached crush depth and it won't go any deeper?

I tried this earlier with a Gato (not in campaign just randomly during a single mission) and had the same result, went to 558 and wouldn't go any deeper. Once I ran my batteries down to nothing, I sank further and eventually crushed (I think it was well past 600 feet) but is there no way to go further without running your batteries out?

[mookiemookie]

Use the deep depth gauge to set your depth manually. I was in sea trials with a Gato and went to 450 feet (the end of the deep dive guage) before lights started flickering in the conning tower. I surfaced and passed the mission.

[Ducimus]

The mission requires you take her down to about 430-440 feet or so. To trigger the mission as completed, you have to be at that depth for about 45seconds to a minute or so.

The balao is the only boat where i set the D key functionality to level the boat off, just before its acutal crush depth. The reason is, the depth gauge only goes to 450 feet. By setting the D key to the saftey depth, i would have impaired the balao, and denied it its one true asset, deeper depth as a "thick skinned" boat, so i had to set the D key function, deeper.

[pythos]

which mission requires to take the boat to its limits?