Fishing

In SUNRISE 2: Isosceles, you can actually fish in the seas, mostly the Mediterranean. Doing so is a good way to earn money to buy disguises, equipment and weapons.

Squid

 * European squid: $50
 * Midsize squid: $20
 * Giant squid: $10,000
 * Kraken: $1,000,000,000 (has a 1/1,000,000,000,000 chance of spawning)