weird situation with David Vincent

[betatester]

David Vincent mission popped near my special underwater mission base with a an osprey with coelecanth HWP.
It ended up with a coelecanth in the basement with no way to get out and a mystery on how it has gone there.
Maybe 2x2 HWP should be forbiden in this mission or pop outside of the house.

[Solarius Scorch]

Good point... It's a rare occurrence to have big units at this stage, so it's never come up before, but I should fix this.

EDIT: done.