| Depth | Pressure | Temperature | Specific energy (J/mol) | |
| (km) | (Gpa) | (K) | Helium | Hydrogen |
| 0 | 0 | 300 | 12,480 | 8652 |
| 10 | 0.3 | 500 | 20,800 | 14,420 |
| 100 | 3.4 | 1800 | 74,880 | 51,912 |
| 500 | 18 | 2000 | 83,200 | 57,680 |
| 1000 | 40 | 2500 | 104,000 | 72,100 |
| 2000 | 88 | 3500 | 145,600 | 100,940 |
| 3000 | 160 | 5500 | 228,800 | 158,620 |
| 4000 | 238 | 5800 | 241,280 | 167,272 |
| 5000 | 321 | 6000 | 249,600 | 173,040 |
| 6000 | 358 | 6200 | 257,920 | 178,808 |