I'll need to double check, but I believe you can refer to the overhead map while you are in the middle of plotting DPL waypoints. This is a good way to pinpoint a target hidden in the fog of war. Just go to the map, click on the alien marker and this will centre the camera on it when you go back to the Battlescape view.
A point on MC - mental attacks gets stronger the closer the attacker is to the target. Dark Angel got weaker and weaker to the MC effects as he got closer to the alien sub. I'm not sure if it would have helped, but if Bob Dole had gone out ahead, the Tasoth might have picked on him a bit more.
Good shooting by Zombie in this mission. Saved the day almost every time he opened fire.
Only if you try to do it with just one person, which can be suicide when dealing with Tentaculats! It's a team effort, and as long as you're not under fire from other enemies, you can take your time.
Have two (or more) aquanauts crowd around the Lobsterman body. One stands over it to revive it by administering stimulants one at a time. Once it wakes up, the other aquanaut, ideally standing right next to the Lobsterman, then shoots . If the Lobsterman isn't killed, the damage will drop its health well under the stun bar and knock it out. It will stay unconscious long enough for you to repeat the whole process over again on the next turn.
It does requires wasting some medicine, but you don't have to cart off any nearby equipment and you even get a couple of cheap shots off.